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8.5 x 35 Diamond C FMAX-HDT 210 25K Equipment Trailer – Ready To Work!

The Diamond C FMAX-HDT 210 is the pinnacle of gooseneck hydraulic dovetail engineering. While "HDT" stands for Hydraulic Dovetail, this is a massive 25,000 lb GVWR tandem dual wheel (TDW) flatbed. It is designed for hotshotters and heavy equipment operators who need a 12' tail that does the lifting for them. KEY STANDARD FEATURES The 2026 Diamond C FMAX-210 Hydraulic Dovetail (HDT) is built on the Fleetneck 2.0 platform, featuring the patented Engineered Beam technology. This trailer is designed for heavy-duty hauling with a GVWR of 25,000 lbs

12' Hydraulic Dovetail

The hallmark of this model is the 12-foot fully automatic hydraulic dovetail. It offers a shallow 12.5° approach angle for easy loading. It is rated to lift and carry up to 10,000 lbs (distributed) and includes a wireless remote and a 5-amp integrated charger.

Engineered Beam Technology

Diamond C uses a 16" Low Profile Engineered Beam (Grade 80 or Grade 100 steel in newer iterations). This design allows the frame to be stronger yet lighter than traditional I-beams by tall-forming the steel to put strength exactly where it's needed.

Sway Control Pipe

Standard on models 30' and longer, a torque tube/sway control pipe runs the length of the trailer to prevent frame twist and improve stability when hauling tall or off-center loads.

Dual 12K Drop-Leg Jacks

The trailer comes standard with dual 12,000 lb drop-leg jacks. Note: While many 2026 dealer stock units are upgraded to 20K hydraulic jacks (the Pacesetter Edition), the base standard remains the heavy-duty manual drop-legs.

HD Slipper Spring Suspension

Equipped with 6-leaf heavy-duty slipper roller springs for the two 10,000 lb axles. This system provides better durability and a smoother ride compared to traditional eye-to-eye springs.

Diamond Plate Neck Box

A large, curved diamond plate storage box is built into the gooseneck. It features a gas-shock assisted lid and provides ample room for chains, binders, and the hydraulic pump system.

Retractable Front Steps

Included are the "Fleetneck" retractable front steps on both sides. These tuck away to prevent damage in tight turns or low-clearance areas and are paired with mid-turn signal steps for safety.

Wheel and Tire Specifications

The FMAX-210 uses a dually configuration to support its 25K GVWR:

Tire Size: ST235/80R16

Ply Rating: 14-Ply Load Range G (Radial)

PERFECT FOR The Diamond C FMAX-210 with the Hydraulic Dovetail is widely considered the "Swiss Army Knife" of heavy-duty trailers. It bridges the gap between a standard flatbed and a specialized equipment hauler.

**Mixed Fleet Operations (Construction)**If you need to haul a skid steer in the morning and a load of lumber or 20-foot sticks of rebar in the afternoon, this is your trailer.

• The Advantage: Unlike flip-over ramps that leave a "bump" or take up deck space, the hydraulic dovetail levels out to give you a full flat loading surface for palletized freight.

High-Frequency LoadingThis trailer is a lifesaver for operators who load and unload 5+ times a day (e.g., equipment rental deliveries or hotshotting).

• The Advantage: No manual lifting of heavy 80-lb ramps. You can deploy or retract the tail in seconds via wireless remote without ever leaving the cab of your truck if necessary.

Low-Clearance MachineryThe 12-foot tail creates a very shallow 12.5° approach angle. This makes it the premier choice for:

• Scissor Lifts: Which often high-center on standard ramps.
• Forklifts: Which require a smooth, low-incline transition.
• Paving Equipment: Such as small rollers or pavers that have minimal ground clearance.

Agricultural UseFor farmers moving tractors with rear implements (like mowers or discs), the hydraulic tail is "load-bearing."

• The Advantage: You can park the rear tires of a heavy tractor right on the dovetail. Since it’s rated to carry 10,000 lbs while in the transport position, you gain valuable deck length that you'd lose with traditional folding ramps.

Professional HotshottingBecause of the Engineered Beam (which is lighter than standard I-beams), the "tare weight" (empty weight) of the trailer is lower.

The Advantage: A lighter trailer means a higher legal payload capacity on your CDL or non-CDL logs, allowing you to get the most out of that 25,000 lb GVWR.

WHY DIAMOND C? (The FMAX-210 Advantage)

ENGINEERED BEAM vs. STANDARD I-BEAM Most trailers use heavy, "off-the-shelf" mill-rolled beams. Diamond C uses a patented Engineered Beam with variable depth. It is taller where the load is heaviest and tapered where it’s not, making it stronger yet lighter than the competition.

HIGH-TENSILE STEEL vs. MILD STEEL While competitors use standard A36 carbon steel, the FMAX-210 utilizes Grade 80 and Grade 100 steel.