Single Wheel Triple Axle Gooseneck Trailer

Model: FMAX307

GVWR: 24,000 lb

The FMAX307 single wheel triple axle gooseneck trailer is versatile and reliable, capable of hauling tractors, equipment, hay, and toys effortlessly. Built for continuous use, it performs 24/7/365, making it the go-to choice for those needing a dependable triple axle gooseneck trailer. Available loading styles for the FMAX307 include Max Ramps, XDR Ramps, 12′ Hydraulic Dovetail, and Straight Deck, offering flexibility and convenience for any load. Trust the FMAX307 for all your heavy-duty hauling needs.

Build Your Own Trailer

At a Glance

GVWR: 24,000 lb
LENGTHS: 25′- 40′
WEIGHT RANGE: 6,740 – 8,180 lbs
BED WIDTH: 102″
FRAME: 16″ Low Profile Engineered Beam
NECK: 12″ Curved Engineered Gooseneck
AXLES: 3 – 7,000 lb Lippert Axles
TIRES: 14 Ply All-Steel Radials
(Upgrade to 215/75R17.5 – 16 Ply)

FMAX Engineered Beam Technology & Logo

NEW FLEETNECK 2.0 FEATURES

New, Lighter Neck

The Fleetneck 2.0 neck web is stronger and lighter with the new 10-gauge Grade 80 material resulting in a 65-pound weight reduction.

New Spare Mount Location

The new spare tire mount location with the easy-to-handle winch that raises and lowers the spare is now located under the trailer deck, guaranteeing it is out of your way until you need it.

Grade 100 Beams

Grade 100 main frame beams with a 10-gauge thickness have doubled the yield strength of the Fleetneck 1.0.

Chain Tray/Winch Mount

Storing your chains is easy with the standard chain tray with a winch mount combination and has the option to add a bolt-on winch box.

Engineered Beam Technology

We design, engineer, and build our own I-Beams. Our U.S. Patent Protected Engineered Beam design allows for the tallest and strongest beams in the industry, with the best strength-to-weight ratios on the road.

Taller beam. Lighter Weight. Stronger Frame.

READ MORE

FMAX Overview Diagram
  1. The Neck – Curves distribute force throughout the neck so there is no concentration of stress in corners like traditional goosenecks.
  2. The Deck – It’s low profile for easy access. Tire-covers are HD 3/16” diamond plate. Boards are capped at each end of the deck for added durability.
  3. 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 traditional goosenecks.
  4. The Lace-rail – Channel-Iron for durability and versatility with no notches or cut-outs for maximum strength. Includes stake-pockets and pipe-spools.
  5. The Box – It’s big and roomy. The lid is curved for added rigidity and gas spring assisted for easy operation.
  6. The Steps – The retractable front deck steps solve the common issue of traditional front deck steps being bent in low clearance situations. The mid-deck side turn signal step makes for easy access when equipment is loaded.
  7. The I-Beams – We engineer the beams, optimize them, and build them for each trailer configuration just like semi trailer manufacturers have been for decades. Our I-beam frames are taller, stronger, and lighter than your neighbor’s. 14-18″ tall. Standard steel bends at 36 ksi. Our beams are built using steel rated at 50 ksi minimum.

Loading Your Way

Max Ramps

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

12′ long with 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 212 Straight Deck Gooseneck Flatbed Trailer

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.

Find a Trailer Dealer Map

How Do I Order an FMAX307?

Great question! Keep scrolling to customize and build your FMAX307 gooseneck trailer to your liking with our interactive build-your-own trailer configurator, then you will be prompted to submit your trailer build to your nearest Diamond C dealer for quote and availability. We have an extensive dealer network of almost 200 dealers strategically placed throughout North America.

Popular Upgrades

FMAX Blackwood Lumber Flooring

Blackwood Lumber Flooring

Rubber infused, pressure treated pine flooring that provides enhanced traction, safety, and durability. Learn more about Blackwood Lumber HERE.

42" Underslung Box

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! Learn more about our storage options HERE.

Quality Trailers Since 1985

Diamond C has been an industry leader for over 35 years since our humble beginnings over 3 decades ago. We strive to be on the forefront of trailer manufacturing by continuously demonstrating excellent quality and value, cutting edge innovation, and superior customer service.

Design Your Own FMAX307

More Than Just A Trailer

Crabb Family

Family Owned and Operated

Over 39 years ago a young East Texas couple embarked on a journey that at the time was merely a means to put food on the table for their growing family. Unbeknownst to them, their nature would have an endless impact on the business they would create…

OUR STORY

Diamond C Team Members representing the Core Values

This is who we are and what makes us Different

Our Purpose is to fuel the growth and success of Diamond C team members, our customers, and our community.
Our Niche is extraordinary trailers and service to match.
Our Core Values are Do Work and Love Strong.

LEARN MORE

DM Powder Coating System

Our custom Difference Maker DM COATING SYSTEM produces extraordinary trailer finishes that are exceptionally durable and beautiful. We offer multiple standard and custom COLORS to perfectly compliment your trailer.

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Learning Center

Your one-stop-shop for everything trailer related. In-depth resources (like our GOOSENECK TRAILER BUYER’S GUIDE) and articles about our trailers, options, culture, and what makes us stand apart from the other guys.

CHECK IT OUT

Maximum Customizability

Choose from a variety of upgrades:

EXTRA STORAGE OPTIONS
BLACKWOOD LUMBER FLOORING
SHOCKER HITCH COUPLER
SLIDE TRACK & RATCHETS
LED LOADING LIGHTS
– and more…

The choice is yours.
Configure your ideal trailer below.

LED Loading Lights 2000 Lumen
Sheffield and Synchrony Logos

Finance Your Trailer

Finance a brand new FMAX307 with ease through one of our trusted financial partners. Find out more HERE.

Diamond C Warranty Logo

Quality You Can Trust

We are proud of our trailers and stand by them. Every Diamond C trailer comes with an industry leading 3 Year WARRANTY.

3 Easy Steps to Build Your Own Trailer

  • Step 1

    Configure your ideal trailer below by selecting your desired specifications.

  • Step 2

    Submit your custom trailer build to your closest Diamond C dealers.

  • Step 3

    Your selected dealer(s) will contact you with final pricing and availability.

Base MSRP: $23,452

*Trailers are shown with base MSRP pricing (Manufacturer’s Suggested Retail Price). MSRP is NOT final sales price - your final sales price varies depending on region and dealer. Be sure to submit your trailer to your local Diamond C dealer for final trailer pricing.

Model

Loading Style

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 from deck and from ground. For safe, stable loading.

Watch Video

Price: $0.00

X
XDR Ramps

24" Wide x 60" Extreme Duty Knee Ramps. These spring-assisted ramps are perfect for loading concentrated machines such as backhoes and excavators where space between the ramps is a necessity for knuckle height clearance.

Watch Video

Price: $0.00

X
12' Hydraulic Dovetail

12' long with easy to climb, 12.5 degree approach angle. Blackwood rubber-infused runners for traction. Automatic latch for easy operation. Includes wireless remote control.

Watch Video

Price: $0.00

X
Straight Deck

Includes 96" Rear Slide-In Ramps (3" Channel). Single piece bumper with light protection.

Price: $0.00

X

Length/Width

Price:

GVWR

Includes 3 - 7,000 lb Lippert Axles

Price: $0.00

X

Ramps

96

Price: $0.00

X

Dove

60

Price: $0.00

X
Wood Filled Dove/Ramp

Ideal for loading equipment with steel tracks.

Watch Video

Price: $644.00

X
60

Price: $0.00

X
12' Fully Automatic Hydraulic Dovetail

12.5 degree load angle with Blackwood infused lumber and automatic latch.

Watch Video

Price: $0.00

X
Full Steel Runner with Cleats

Price: $468.00

X

Price: $363.00

X

Axles

3 - 7,000 lb Super Lube Logo

Price: $0.00

X

Brakes

Electric Drum

(Forward Self-Adjusting)

Price: $0.00

X
Electric-Over-Hydraulic Disc Brakes

Price: $4,140.00

X

Suspension

Torsion Axles

Rubber Torsion Suspension Axles: Improves suspension characteristics of leaf spring axles.

Price: $1,656.00

X

Pull Type

12

Curves distribute force throughout the neck so there is no concentration of stress in corners like traditional goosenecks.

Price: $0.00

X
6

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

Price: $237.00

X

Frame

16X

Jack

2 - 12,000 lb Drop-Leg Jacks

Two heavy duty, square, drop-leg trailer jacks with a side-wind handles. Constructed of engineered alloys for enhanced strength, stability and side-load capability.

Price: $0.00

X
2 - 25,000 lb Two Speed Drop-Leg Jacks

Price: $1,425.00

X
2 - 20,000 lb Hydraulic Jacks

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

Price: $2,150.00

X

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

Price: $1,555.00

X

Model

Tire Size

Price: $0.00

X
215/75R17.5 18 Ply Radial

Our Heavy Duty Tire/Wheel Package. Includes 5/8" Studs.

Price: $690.00

X

Wheel Color

Black

Price: $0.00

X
Two Tone Aluminum

Price: $720.00

X

Spare Mount

Under-Frame Spare Mount

Price: $0.00

X

Spare Tire

Price: $308.00

X

Price: $517.00

X

Price: $310.00

X

Price: $517.00

X

Price: $405.00

X