Research & Development

“If we can’t find a way, then we create a way…”

Shoutout to our Research & Development Team for always pushing the envelope in the trailer industry!

From our best selling HD V-TONGUE LID storage option to our patent protected ENGINEERED BEAM TECHNOLOGY, these guys put the “extra” in extraordinary! 💪

Research & Development is a very important part of who we are and what we do. Diamond C has never been about building just another average trailer – it’s about pushing the limits of what’s possible to build the very best trailer we possibly can. Whether that’s one little nuance of a trailer design, or building a whole new concept from scratch, every time we approach a new project our mantra is – “How can we make it stronger, lighter, look better, and ultimately deliver more value and use to our customers?” 

R&D is an ongoing and constant pursuit – after 35+ years of building trailers, we are building the best trailers we have ever built, and delivering a better product from all the cumulative years of experience and forward innovation that is rooted deep in our CULTURE.

For a full list of Diamond C innovations from our R&D Team, check out the entire SEE THE DIFFERENCE section of our website for more information on cutting edge trailer design and innovative options such as:

And much more…


For the full story check out this video below:

We use LIPPERT COMPONENTS AXLES on all of our Diamond C trailers. Lippert provides an ultra-high-quality product, utilizing state-of-the-art robotic welders to ensure the highest precision and quality on every axle. Lippert offers a full line of reliable spring, torsion, and heavy duty axles to meet every trailer application and need.

Here are 6 big reasons why we are proud to partner with them and use their quality axles on our trailers:

  1. Over the last fifteen years, Lippert has done an incredible job at building a feature rich, ultra high-quality product and production system that ensures accuracy.
  2. They invest BIG in customer support with a 100+ person call center that is staffed 24/7 with highly trained technical representatives, plus extensive training resources available.
  3. Lippert is a strong and stable company built with family business values, partnerships, and accessibility. When we call, they listen and respond in a way that proves it.
  4. Continuous improvement is rooted deep into Lippert’s culture. They’re always yearning to advance and to make tomorrow better than today, just like Diamond C!
  5. Their brand name and parts distribution network is extensive with genuine Lippert components available through Redneck, Amazon and many other distributors.
  6. While Lippert axles offer many design advantages over other brands, they are intelligently designed in order to allow part interchangeability with other leading brands on common wear parts such as brake components.

Lippert Axles Production


– Premium Black Powder Coat Finish
– Zinc-Plated Hardware
– Waterproof Electrical Connections
– Integrated One-Piece Spindle and Flange for improved alignment and strength
– Assembled in the USA


Limited 1 Year Warranty – Grease and Oil Seals for all Axles
Limited 6 Year Warranty – Spring Axles and Suspension Systems
Limited 11 Year Warranty – Torsion Axles

Lippert Axles Warranty Flyer

Lippert Axles Video

(Source: Lippert Components YouTube Channel)


For more information download the Lippert + Diamond C feature sheet below:


If you thought a fender was just a fender, think again! Diamond C offers a variety of customizable fender choices for your trailer. Some options are for looks, and some are for added functionality and protection. Keep scrolling to learn more about our fender choices for your trailer.

16 ga Smooth Fender

Our most basic fender, found on our standard GSA general duty utility trailer.

GSA 16 ga Smooth Fenders

16 ga Smooth Fender with Gravel Guard

Offered as the standard fender on most UTILITY and CAR HAULER models.
Includes a gravel guard for protection against rock chips.

16 ga smooth fender with gravel guard

On tandem axle trailers this fender has a teardrop in the middle for added coverage.

RBT 16 ga Teardrop Fenders w/ Gravel Guard

CAR HAULERS equipped with our “Pro Package” feature an aluminum gravel guard for a flashier look when hauling your show car.

GTF 16ga Teardrop Fenders

14 ga Diamond Plate Fenders

An available option on most UTILITY and CAR HAULER models, and standard on most of our heavier class EQUIPMENT and DUMP trailers.

UVT 14 ga Diamond Plate Fender
RBT 14 ga Teardrop Fenders, Diamond Plate
EDU 14 ga Teardrop Fender, Diamond Plate

3/16″ Super Heavy Duty Diamond Plate Fenders

Our 3/16″ Super Heavy Duty Diamond Plate fender option is a must for contractors and work crews whose environment requires equipment outfitted with the toughest features known to man. Pairs great with our HD 215 TIRE UPGRADE. Popular on heavier duty trailers like the TUT and EDU utility trailers, MVC Multi-Vehicle Carrier, flatbed equipments including EQT, LPX, and HDT, and our medium and heavy duty dump models (EDG, EDM, LPD, and LPT).

EDU 3/16" Diamond Plate Fender, Super Heavy Duty
LPD 3/16" Heavy Duty Fender
LPD 7 ga Dump Body Upgrade

3/16″ Heavy Duty Fenders Video

Drive-Over Fenders

Drive-Over fenders are especially handy when loading wide equipment. Found as an upgrade on all CAR HAULERS and Equipment Trailer models EQT, LPX, and HDT. These pair great with FRAME EXTENSIONS for those extra-wide loads.

GTF 3/16" Diamond Plate, Super Heavy Duty Fenders, Drive-Over
Diamond Plate Frame Extensions
Frame Extensions

Removable Fenders

In certain cases, we’ve found that some trailer users prefer the option to have removable fenders depending on what cargo or equipment they are hauling. Dealers who ship large quantities of trailers greatly benefit from this as it means they can stack more trailers on each load.
Most of our flatbed models (UVT Utility, all CAR HAULERS, and EQT, LPX, and HDT Equipment trailer models) feature bolt-on fenders as standard, so they can easily be removed in a few steps by undoing 4 bolts.

Removable Fenders 2
Removable Fenders 3

Black Painted Fenders

Have a non-standard COLOR trailer with bolt-on fenders and want to stand out? Add black painted fenders for a cool 2 tone look.

UVT Utility trailer with black painted fenders

Extraordinary Trailer Finishes

While many trailer manufacturers choose powder coat and finish processes based solely on their material and operating costs, we designed this “Difference Maker” Powder Coating System to produce extraordinary trailer finishes.

The mantra is simple: Improve everything. Sacrifice nothing.

These are the priorities:
– Adhesion
– Corrosion resistance
– Chip & abrasion resistance
– Gloss & color retention
– Curb appeal

We’ve spared no effort or expense to ensure that each Diamond C trailer comes with an extraordinary finish that is exceptionally durable and beautiful.

We’ve partnered with Sherwin Williams to bring more enhanced color options, and are proud to offer multiple standard & special colors to choose from. View our comprehensive COLOR GUIDE to see all of our standard and custom colors up close.

How Does it Work?

Listen in as Jacob walks you through the entire powder coat process, start to finish:

We use a 6 step process to ensure our custom trailer powder coating is the best coating option for your trailer:

Step 1:

Each trailer frame is blasted with steel shot to remove mil-scale and add an anchor profile for primer to adhere to.

Step 2:

Then we wash them with a 5 stage wash process to clean the steel, add corrosion resistance, and balance pH.

  1. Alkaline wash removes blast dust and oils
  2. High pressure rinse
  3. Phosphate salt rinse inhibits rust and helps with paint adhesion
  4. High pressure rinse
  5. Final sealing rinse is applied

All wash water is reverse osmosis (RO) purified to ensure consistency

Step 3:

Washed frames are promptly force dried as they travel through our dry-off oven at 300 degrees. This prevents flash rusting and ensures that frames are primer ready.

Step 4:

Ultra-corrosion resistant Onecure Zinc Epoxy Primer powder coating is electrostatically applied to the entire trailer frame.

Step 5:

Smooth, high gloss, Onecure Technology Top Coat is electrostatically applied to the entire trailer frame.

Step 6:

The top coat is cured as the frame travels through our 165′ final-cure oven at 450 degrees. All steel surpasses 425 degrees to ensure complete curing of primer and top coat.


  • Pretreatment. Some powder coaters only blast. Some only wash. Some do a little of each. Every trailer that we powder coat is thoroughly blasted, washed clean, and chemically pretreated before powder application to ensure optimal surfaces for powder adhesion and corrosion resistance.
  • Powder. All powders are not created equally. We use Sherwin William’s most advanced ultra-durable primer and top coat.
  • Hardware. Our powder line is highly engineered and 2400’ long with plenty of breathing room for thorough processing. Trailers flow through at a steady pace with no pushing or pulling required. It includes a number of pits and platforms throughout to enable operators to access trailers, over and under, comfortably and with ease which results in excellent coverage and consistency.
  • Purity. We use an extensive system of filters, separators, and refrigerated and dessicant air dryers to ensure that the compressed air we use for powder application is extremely pure, dry, and uncontaminated.
  • Control. All powder is applied in an environmentally controlled room for optimal application consistency. 60-80 degrees F.
  • Ovens. They’re convection ovens with several thousand points of air flow, electronically monitored and balanced, and have 18 million BTU’s of natural gas powered heat available to ensure consistent, complete powder curing.
  • Process. We audit the entire process, a multi-point inspection, every single day of operation to ensure that every machine, step, and process is performing consistently and optimally. Additionally, critical performance factors are monitored hourly at each booth to maintain tight controls and standards.


View the attached flyer for a more in-depth look at our Powder Coat process.


DM Coating Systems Flyer

What is hot shot trucking?

Hot shot trucking is becoming an increasingly popular way for flatbed trailer owners to make a living while on the road. Hot shot truckers often drive class 3, 4, 5, or 6 rated pickup trucks (instead of full on semi-tractors), so generally it’s a more cost effective and accessible way to get into the industry. Hot shot truckers will often do “for hire” freight jobs, usually as an expedited delivery for an individual customer. Common hot shot loads may include construction materials, heavy machinery or equipment, farm materials, or other time-sensitive materials. Hauls can range anywhere from short local distances to even across country if necessary.

Why pick Diamond C for your hot shot trailer?

Diamond C is excited to partner with hot shot trailer users throughout North America to provide the very best possible trailer for this industry. Hot shot trailer users demand durability and versatility from their equipment, and we offer a variety of flatbed GOOSENECK and STEP DECK trailers to deliver on those demands.

Our trailers feature U.S. Patent Protected ENGINEERED BEAM TECHNOLOGY, which allows us to custom design, engineer, and optimize our own I-Beams to fit each model’s specific weight classification and perform at its highest level. Our Engineered I-Beam trailers are stronger yet lighter, featuring the best strength-to-weight ratios of any steel frame gooseneck trailer on the road.

The result? Haul more, haul longer, and haul safer with a Diamond C.

Keep scrolling to view our most popular models, options, and upgrades for hot shot trailer owners.

Diamond C FMAX216 Fleetneck Engineered Beam Gooseneck Hot Shot Trailer


Length and Width

Diamond C GOOSENECKS are available from 20′ to 44′ lengths, with the most popular hot shot trailer selected being 40′ long. All our flatbed gooseneck trailers feature a 102″ bed width.

FMAX Diagram


Our ENGINEERED BEAM TECHNOLOGY allows for a considerably lighter trailer than most. This is hugely important for hot shot trailer users, as choosing a higher rated GVWR trailer in a longer length (like our 40′ FMAX216 w/ 40K Package) allows for more weight savings benefit, which yields a higher payload capacity.

Valcrum Hubcaps Axles


Lippert Axles

Most hot shot users opt for either 10K, 12K, or 16K dual tandem axles. These can be found on models FMAX210 through FMAX216. We also have options for triple axle setups using 3 – 7K, 3 – 10K, or 3 – 12K configurations. We use high quality LIPPERT AXLES on all our trailers.

Valcrum Hubcap

Valcrum Hubcaps

We include Valcrum’s premium aluminum alloy oil hubcaps to all our 8K – 16K axles as standard. VALCRUM provides a stronger, durable threaded hubcab for heavier duty trailer axles to replace the standard factory plastic cap.

3" Ball 40,000 lb Adjustable Coupler

40K Package Upgrade

Available on models FMAX312 and FMAX216, this heavy duty 40,000 lb GVWR upgrade includes a 3″ Ball 40K TELESCOUPLER and frame and neck reinforcements for maximum strength.

Confused about GVWR vs Payload and wondering how much cargo you can safely haul? Read THIS article first.

FMAX210SS Air Ride Suspension

Tire/Wheel Upgrades

Super Single Tires

Inspired by the “Super Single” trend in the trucking industry, our FMAX212SS and FMAX210SS are pound for pound the strongest single wheel gooseneck on the market. Both models come standard with 235/75R17.5 18 ply SUPER SINGLE tires.

215/75R17.5 Tire Upgrade

HD 215 Tires

The heavy duty 215/17.5 wheel and tire UPGRADE is widely used and preferred among high mileage trailer owners, especially in the hot shot, oil field, and transport industries. Our 215/75R17.5 upgrade tires feature a bigger wheel/tire than standard, along with beefy 5/8″ studs. If that’s not enough for you, we use premium VALCRUM HUBCAPS on all 215 tires on 8-16K axles.

These tires come standard on model FMAX216.

Electric Over Hydraulic Disc Brakes

Brake Options

Hydraulic Disc Brakes

Electric over hydraulic disc BRAKES are what avid hotshot trailer users would describe as “the ultimate” when it comes to trailer braking systems. They are operated by an in-cab controller providing an electric pulse from the tow vehicle which activates a small hydraulic pump that sends hydraulic fluid to a disc (rotor) / caliper braking component.

Benefits of Hydraulic Disc Brakes:

  1. Last longer
  2. Stop faster
  3. Cheaper to maintain for high mileage trailers

*Note: Electric drum and electric over hydraulic drum brakes are also available.

Gooseneck Shocker Hitch Coupler

Coupler Upgrades

All our goosenecks come standard with the 25,000 lb Bulldog BX1 coupler. Upgrades include:

  1. SHOCKER HITCH coupler which features an airbag for for a smoother, safer ride
  2. TELESCOUPLER” adjustable coupler that includes a 3″ ball 40,000 lb dual vertical adjustment (comes standard on 40K GVWR upgrade packages)
  3. King-Pin Adapter

Ridewell Air Ride Suspension


Air Ride Suspension

For a smoother, quieter ride, extended trailer life, & higher rates per mile, choose our RIDEWELL AIR RIDE SUSPENSION. We also have an option for front lift axle, which saves tire wear & fuel consumption on empty hauls. Air Ride includes dual compressors, one 10V 5amp charger and dual Group 27 continental batteries.

Hutch Heavy Duty Suspension

Hutch Heavy Duty Adjustable Suspension

This is a great option for those who want a more durable suspension than the standard leaf slipper spring suspension, but might not have the budget to equip their trailer with Air Ride. We use Hutch 9700 Series – which features easily adjustable torque arm screws, a maintenance free fastening system, and “Million Mile Rocker Bushing” which eliminates bushing fatigue and failure. Hutch suspension comes standard on model FMAX216, and is an available upgrade on most other dual tandem gooseneck trailers.

Max Ramps

Loading Options

Max Ramps

44″ wide ramps for MAX versatility. 50 ksi steel ramp frames x 4 frames per ramp for MAX strength. HD Spring loaded for easy lifting. For safe, stable loading. Read more HERE.

12' Hydraulic Dovetail

12′ Hydraulic Dovetail

Our industry leading 12′ hydraulic dovetail features an easy to climb, 12.5 degree approach angle. Includes BLACKWOOD rubber-infused runners for traction, automatic latch for easy operation, and wireless remote control. Read more HERE.

XDR Ramps

XDR Ramps

These 24″ x 60″ spring-assisted extreme duty knee ramps are perfect for loading concentrated machines such as backhoes and excavators where space between the ramps is a necessity for knuckle height clearance. Read more HERE.

FMAX Straight Deck

Straight Deck

The Straight Deck tail configuration includes 3″ channel 96″ Rear Slide-In Ramps that can be conveniently stowed away when not in use. Come with a single piece bumper with light protection.

Bolt-on LED Floodlights

Popular Add-ons

Bolt-on LED Flood Lights

At 2700 Lumen, these LED work lights will help brighten up your nighttime grind.

Slide Track & Ratchets

Slide Track

Our SLIDE TRACK and ratchet option gives you unlimited tie-down points the entire length of the deck. Sliding ratchets move easily in both directions for positioning on the track but lock firmly in place when tension is applied.

13DEC Tie Downs 5/8" D-Rings

Tie Downs

Every Fleetneck and Step Deck trailer comes standard with a 2″ x 3/8″ Rub Rail that includes Stake Pockets & Pipe Spools.

Add up to 10 5/8″ D-Rings for even more cargo securing possibilities.

FMAX212 Sway Control

Sway Control

Ensure our longer trailers are as stable as possible and don’t suffer from frame warping, flexing, or swaying while hauling extreme loads. Read more HERE.

(Included standard on any trailer over 30 ft)

17.5K Warrior Winch Box Package

Warrior Winch Box Package

Needing to load dead or downed equipment? Our loaded WARRIOR WINCH BOX PACKAGE is a great addition to your trailer to do just that! With 3 sizes: 8K, 12K, and 17.5K, you can pick what suits your needs best. These lockable winch box packages are self-contained and include a Continental Group 27 Series BATTERY and a 110 Volt 5 Amp plug-in charger.

Fleetneck 6" Taller Neck

6″ Taller Neck

This option raises the coupler and horizontal neck height +6″. Ideal for lifted vehicles (ex. Dodge 3500 with 4″-6″ lift).

FMAX212 7' x 8' Weld-on/Bolt-on Deck on the Neck

Deck on the Neck

The 7′ x 8′ weld-on or bolt-on DECK ON THE NECK offers additional cargo space for those of you who need every last square inch.

Great for hotshot rigs, hay haulers, construction crews, and more!

Stillwell Hydraulic Jacks

Jack Options

Hydraulic Jacks

Get 24,000 lb of combined lift power for hooking your trailer up in mere seconds. These 12K hydraulic jacks are powered by a KTI HYDRAULICS unit, and includes a Group 27 Series BATTERY which provides both power up and power down. The optional SOLAR PULSE charger provides a hassle-free way to ensure your hydraulic pump battery is fully charged.

A must have for anyone who hooks and unhooks their trailer often! Fast, convenient, and strong.

Diamond C FMAX212 Fleetneck Engineered Beam Gooseneck Trailer

Two Speed Drop-Leg Jacks

2 – 25,000 lb two speed jacks that feature faster cranking than normal drop-leg jacks and include a state of the art 2 speed gearbox with power and speed for a more effective and efficient jack.

Diamond C FMAX208 Fleetneck Engineered Beam Gooseneck Trailer

Flooring Options

Treated Lumber

Pressure treated PINE FLOORING is the most commonly used wood flooring material in trailers and comes standard on most Diamond C trailers.

Oak Floor on an FMAX Hydraulic Dovetail

Oak Flooring

When you know the job is grueling and the floor of your trailer is going to take a beating, the OAK FLOOR option is for you. Oak lumber is not as susceptible to being gouged, scraped, or broken down like its softer pine counterpart.

FMAX Blackwood Lumber Flooring

Blackwood Lumber

BLACKWOOD is rubber infused, pressure treated pine flooring that provides enhanced traction in the wettest conditions, outstanding impact resistance in the toughest environments, and increased flooring lifespan from its no fade, no crack technology. Choose between outer or full.

Diamond Plate Neck Box w/ Gas Shock Assisted Lid

Storage Options

Neck Box

This lockable neck box is big, roomy, and is perfect for storing all your jacks, tools, straps, and more. Constructed with 3/16″ diamond plate, this box features a curved lid for added rigidity and is gas spring assisted for easy operation.

42" Underslung Storage Box

Underslung Box

This 14″ x 14″ x 42″ box is a popular add-on to any FLEETNECK trailer for handy below-deck storage that’s convenient to access, but also out of the way of the equipment your are hauling. Add one on each side of your trailer if you want!

8' Under-Slung Dunnage Rack Storage

102″ Underslung Dunnage Rack

Perfect for hot shot trailer users who need to store wood planks or blocks to assist with loading pipe or equipment. This rack is mounted under the deck for better placement, and welded to the main frame of the trailer.

FMAX Full-Width Locking Chain Rack, Bolt On

Locking Chain Rack

Your choice of either a 16″ bolt-on rack or a full-width weld-on chain rack. The bolt-on rack can be mounted to either driver or passenger side, and both are great options to secure your chains and boomers.

FMAX Chain Tray

Chain Tray

This convenient shelf is welded at the top of the neck for easy access chain storage.

How Do I Purchase?

Diamond C has an extensive network of almost 200 dealer partners strategically placed throughout North America. Find your closest dealer HERE to enquire about available gooseneck or step deck trailers, or simply navigate to any trailer product page to design your own trailer to your unique specifications and submit it to your local Diamond C dealer for quote.

What is the best hot shot trailer?

The most popular hot shot trailer we sell is model FMAX212 in a 40′ length equipped with MAX RAMPS and AIR RIDE SUSPENSION. For those who need a 30K or even a 40K GVWR equipped trailer, we recommend our flagship model FMAX216.

Fleetneck Engineered Beam Trailer
Model LPD Dump Trailer Gooseneck Package with Engineered Beam Technlogy

Lighter – Stronger – Engineered to Deliver

Diamond C is forging a new era in trailer design with our Engineered Beam Technology. We design, engineer, and optimize our own U.S. Patent Protected I-Beams to fit each model. Our Engineered Beam GOOSENECK trailers are stronger yet lighter, featuring the best strength-to-weight ratios of any steel frame gooseneck on the road. We have also recently brought this technology to select DUMP and EQUIPMENT trailer models.

But first, a little history…

The year was 2015, and we had been building gooseneck trailers just like the rest of the industry for the past 30 years. We purchased standard I-Beams and sliced and diced them and added reinforcement to make strong trailers out of them. While we had always been proud of our gooseneck trailers, we came to a place of unrest. We knew that there had to be a better way.

We started studying the strength dynamics of I-Beams and quickly turned to flat-bed semi-trailers for inspiration. For decades the semi-trailer manufacturers have been building their own I-Beams, custom to each trailer configuration. They realized long ago that standard beams were not the best solution for the strongest, lightest trailer frames. They needed taller beams considering the span of the frames without the excess weight that comes with taller standard beams.

The same principles clearly applied to gooseneck trailer framing so we set out to design, engineer, and build our own I-beams.

After nearly three years of research and development, the Fleetneck Engineered Beam product line was the result. We proudly debuted the brand new Engineered Beam goosenecks at the 2017 NATDA Trade Show and took the flatbed gooseneck trailer world by surprise. In 2019 we were awarded a U.S. Patent for our efforts.

We now have an almost infinite control over the shape of the beams. We’re able to optimize the performance of the steel by putting it to work where we need it most. No dead weight. No added reinforcements needed. We’re able to build contours into the beams that optimize the total design and functionality, from dovetails to deck-height. Our beams are the tallest and strongest in gooseneck trailers, with the best strength-to-weight ratios on the road.

Fast forward to 2020, and we are now bringing the technology behind the Engineered Beam design to the rest of our product lineup, starting with Dump and Equipment trailers. Diamond C has always been a pioneer in trailer innovation and a leader in pushing the industry forwards, and our beam design is certainly no exception to that. Watch this space for more news and upgrades, and in the meantime, keep scrolling to find out more about how our patented beam design helps your trailer be one of the best in the world.

Engineered Beam Story Video

What if one day you imagined that there had to be a better way? What if the better way you dreamed of was radically different than what everyone knew? What if you had to bet your career and the jobs of hundreds of people of your idea — that it would work and win the day? What if it worked? What if it made things possible that weren’t possible before? What if it opened up new opportunities and super charged the growth and success of your team members, customers, and community?

Tune in below as Jeffery & Jacob Crabb tell the story of how Fleetneck Engineered Beam Technology came to be.


Engineered Beams

We engineer the I-Beams, optimize them, and build them for each trailer configuration, just like the semi-trailer manufacturers have been doing for decades.

Our Engineered I-Beam frames are taller, stronger, and lighter than the industry standard for deck-over and flatbed trailers. Depending on the model, the beams on our GOOSENECK trailers range from 14-18″ tall, and the beams on our compatible DUMP and EQUIPMENT trailer models range from 10-12″ tall.

Our Engineered Beam is fabricated from scratch in-house, allowing us complete control over beam size, configurations, and even weights. The beam’s web is cut and shaped before the continuous one piece flanges are welded onto the top and bottom of the web, creating the Engineered Beam.

Standard steel will buckle and break at 36 ksi, and we didn’t compromise there either; our beams are built using steel rated at 50 ksi minimum, so it springs back no matter what load you put on it.

Don’t believe us? Download the attached flyer with shows a stress analysis comparing our Engineered Beam vs the Industry Standard on a dual tandem gooseneck trailer.

Engineered Beam Comparison Graphic
FMAX216 18" Engineered Beam (Low Profile)

Model FMAX216 Gooseneck Trailer with 18″ Engineered Beam

LPX Engineered Beam Frame

Model LPX Low Profile Extreme Duty Equipment Trailer

WDT 16" Engineered Beam Frame

Model WDT Dump Trailer with 16″ Engineered Beam

LPD Engineered Beam Frame

Model LPD Heavy Duty Low Profile Dump Trailer

The Camber

The deck and frame have a slight camber when not loaded. When loaded, it flexes as necessary to level but never sags like in traditional goosenecks.

Diamond C FMAX307 Fleetneck Engineered Beam Gooseneck Trailer

Model FMAX307 Gooseneck Trailer

Diamond C PX310 Pintle Hitch Engineered Beam Trailer

Model PX310 Pintle Hitch Trailer

Models Offered On

Currently, we offer Engineered Beam Technology on the following models (with more coming soon):

  1. All Gooseneck FMAX Fleetneck Series Trailers
  2. All Pintle Hitch PX Series Trailers
  3. All Step Deck SDX Series Trailers
  4. Dump Models: WDT Dual Tandem Gooseneck Dump, LPD Heavy Duty Low Profile Dump, and LPT Telescopic Dump Trailers
  5. Equipment Models: LPX Low Profile Extreme Duty Equipment Trailer

Engineered Neck

You’ll notice our goosenecks look very different than normal flatbed gooseneck trailer necks do. This is by design. Our curved one-piece fabricated 12″ Engineered Neck design distributes force throughout the neck so there is no concentration of stress in the corners like on traditional goosenecks. These Engineered Necks come standard on any gooseneck FLEETNECK series trailer, and well as on most of our bumper-pull trailers featuring our optional GOOSENECK PACKAGE upgrade.

Check out the Engineered Neck stress test and sizing flyers below, which compares our Engineered Neck with a traditional I-Beam neck on the same gooseneck trailer:

Engineered Beam vs Traditional I-Beam Neck
Fleetneck Stress Analysis


FMAX212 12" Engineered Neck

Model FMAX212 Gooseneck Trailer

LPD 12" Engineered Gooseneck Package

Model LPD Dump Trailer

Models Offered On

Currently, we offer Engineered Neck Technology on the following models with optional GOOSENECK PACKAGE enabled:

  1. Dump Models: WDT Dual Tandem Gooseneck Dump, LPD Heavy Duty Low Profile Dump, and LPT Telescopic Dump
  2. Equipment Models: LPX Low Profile Extreme Duty Equipment, EQT Heavy Duty Equipment, and HDT Tilt Trailer
  3. Utility Models: TUT “Texas” Tandem Axle Utility and EDU Heavy Duty Utility
  4. Car Haulers: Model MVC Multi-Vehicle Carrier

Engineered Beam Trailer Videos

LPD Dump Trailer Video

3D Animation Video

FMAX207 Video

PX310 Pintle Hitch Trailer Video

Engineered Beam Flyer

Considering the landmark advancements in the way we frame our trailers now with Engineered Beam Technology, we resolved to optimize the total gooseneck trailer design, not just the frame. So we set out to make every part of our Fleetneck GOOSENECK trailer lineup the best it could be. You’ll find problem solving, intelligent design incorporated from the dovetails to the deck steps and everywhere in between. View the flyer below for more information.

Fleetneck Engineered Beam Flyer


The XDR Extreme Duty Knee Ramps were specifically designed to haul heavy concentrated equipment and machinery such as backhoes and excavators. The space in the middle is a necessity for knuckle height clearance, and is left open and void to be able to set a bucket or forks down for transport mode.

These ramps include the intelligently designed over-center latch hold down system featured on our MAX RAMPS, as well as the same two-point hinge technology and spring combination that makes loading and unloading a breeze.

These beefy ramps measure 24″ x 60″, and use the same strong Grade 50 material that is found in our ENGINEERED BEAM FRAMES.

XDR Ramps
XDR Ramps


  1. 24″ x 60″ extreme duty ramps
  2. Heavy duty support knee for additional durability
  3. 50 ksi steel ramp frames with two-point hinge system
  4. HD Spring loaded for easy lifting from deck and from ground
  5. Aggressive angled cleats for traction in the slickest conditions
  6. Open pit for extra clearance

Available on models:

These heavy duty ramps are available on most of our deck over trailers that utilize our patent protected ENGINEERED BEAM TECHNOLOGY, including:

  • All FMAX Fleetneck series gooseneck trailers
  • All PX series pintle hitch trailers
  • All SDX series step deck trailers

XDR Ramps
XDR Ramps

Do you know trailer brakes? Diamond C offers 3 types: Electric Drum, Electric Over Hydraulic Drum, and Electric Over Hydraulic Disc brakes.
Below are some helpful tips for choosing the right brakes for your trailer.

Electric Drum Brakes

Electric drum brakes are the utility and flatbed trailer industry standard for trailer braking systems. Electric drum brakes are controlled by an in-cab controller that comes standard on many of today’s trucks and SUVs. Electric drum brakes are well suited for most general use applications – trailers that are used moderately within their capacity and towed with some regularity. If you plan to use your trailer aggressively in relation to its PAYLOAD CAPACITY and plan to tow it on a more regular basis, then keep scrolling to see our electric over hydraulic brake options below.

Electric Over Hydraulic Drum Brakes

Electric over hydraulic drum brakes are similar in that they are controlled by the same in-cab controller as standard electric drum brakes. They also share the same actual drum braking components. Where they differ is that instead of electromagnetic force being utilized to help slow the trailer, the electric pulse from the to tow vehicle activates a small hydraulic pump that sends fluid into the drum to forcefully apply braking pressure. 

Electric Over Hydraulic Disc Brakes

Electric over hydraulic disc brakes are similar to both previous brake types in that they are operated by an in-cab controller. However, disc brakes are what avid heavy duty trailers users would describe as “the ultimate” when it comes to trailer braking systems. They use the same hydraulic force we mentioned in electric over hydraulic drum Brakes for better braking pressure, but where they differ is the use of disc (rotor) / caliper braking components in lieu of the drums. Disc brakes provide increased stopping power over drums. In addition, disc brakes are more cost effective when it comes to upkeep and preventative maintenance over time. With disc brakes you are able to replace individual brake pads, versus replacing the more costly full drum braking assembly.

If you are a gooseneck HOT SHOT trailer user who puts in a lot of miles over the years, we highly recommend hydraulic disc brakes.

Benefits of Hydraulic Disc Brakes:

  1. Last longer
  2. Stop faster
  3. Cheaper to maintain for high mileage trailers

On August 11th, we hired our 500th team member! We are so thankful for the journey this far, for the team, for you all, and for the growth and success of our team members, customers, and community to come! 

Listen in as Jeffery speaks to the heart of the matter. 🔹💪💙

#DoWork #LoveStrong

Differentiate your business. Stand out. Lead the way.

Listen in on this video series as Jacob Crabb, our VP of Sales & Marketing, shares practical tips and methods for making your business, product, or dealership stand out and rise above the competition. In today’s competitive world, being unique and intentional with your customer strategy matters.

(This page will be updated as new episodes are filmed)

Episode 2 – Raving Fans

In this Dare to be Different video we break down the customer service strategy that Diamond C strives to live out called “Raving Fans” and challenge you – if you have a business, big or small, to apply and strive for it too!

Episode 1 – Differentiate Your Dealership

Dare to be Different Challenge:

Carve out 30 – 45 minutes of uninterrupted time to truly unplug – step outside – take a deep breath and begin to evaluate your business:

  • How are you any different from the guy down the street?
  • How is your product offering any different? What can you do to make it stand out?
  • Put yourself in the customers shoes. What is the customer experience like from the moment they enter your door to the moment they leave?
  • How can you create raving fans of your brand / dealership? A raving fan is more than just a return customer – they are your best salesman.