2026 Diamond C FMAX312 40K PKG 35' x 102" XDR

2026 Diamond C FMAX312 40K PKG 35' x 102" XDR

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  • Year 2026
  • Make Diamond C
  • Model FMAX312 40K PKG
2026 Diamond C FMAX312 40K PKG 35' x 102" XDR

2026 Diamond C FMAX312 40K PKG 35' x 102" XDR

2026 Diamond C FMAX312 40K PKG 35' x 102" XDR

With an up to 40,000 lb GVWR, 18" Engineered Beam frame, and 9,000 lb curb weight, the FMAX312 triple dual wheel gooseneck trailer is the undisputed king of the road. This FMAX312 gooseneck trailer sets the benchmark for strength and capacity, making it the ultimate choice for heavy-duty hauling.

Features may include:

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.
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.

Dimensions

Length 35'
Width 102"
Coupling 3" Ball - 40,000 lb Adjustable Telescoupler

Capacities

Axle Capacity, Rear 12,000 lb Heavy Duty, Oil Bath
Storage Capacity Diamond Plate Neck Box w/ Gas Shock Assisted Lid

Weights

GVWR 40,000 lb

Chassis

Chassis Crossmembers: 3" I-Beam on 16" Centers w/ Formed Gussets
Mainframe 18" Engineered Beam 2.0
Axle Count 3

Wheels & Tires

Tires, Rear Specification 235/80R16 14 Ply Radial, Dually

Color

Colors Onyx Black | Artic White | Scarlet Red | Cement Gray | Carbon Metallic Gray | Platinum Silver Metallic | Mocha Metallic | Dynamic Blue Metallic

Features

Features Dove: 60" Dovetail with 2" x 2" x 1/8" Angle Cleats (XDR Ramps) | Pull Type: 12" Engineered Gooseneck | Jack: 2 - 12,000 lb Drop-Leg Jacks | Floor: 2" Treated Lumber | Winch: Winch Tray | Lace Rail: 6" Channel Lace Rail | Stake Pockets: 2" x 3/8" Rub Rail w/ Stake Pockets & Pipe Spools | Steps: Front Retractable & Mid-Turn | Spare Mount: Under-Frame Spare Mount | Sway Control

Suspension

Suspension Slipper Roller HD

Lights and Safety

Lighting All LED Lights
Harness Sealed Wiring Harness

Brakes

Brake System Type Electric Drum

Product Photography