Diamond C 40′ Gooseneck Hydraulic Dovetail – FMAX212


The engineered beam gooseneck from Diamond C coupled with a Hydraulic Dovetail AND Hydraulic Jack option makes this one of the most sought after goosenecks on the market today. Unparalleled durability and easy loading will make your life easier on the job site.

Pricing Options

Available for Order

Heavy Duty

Build Quality

Best Value

Locking Toolbox

Perfect storage for chains and straps. Keyed lock offers security from theft.

Hydraulic Dovetail

Push a button and load or unload your equipment. No more flip ramp hassles make this a great option.

"I would just like to say, Brett Costa and the staff at Complete Trailers are first class, I special ordered my trailer and we were pushed to reach our deadline.  Brett made sure the trailer was delivered on time.  That’s the kind of business I like to do."

View all Testimonials
Rob H. - Consolidated Fabricators and Constructors


  • Dimensions

    • GVWR: 24,000lbs
    • Empty Weight: 7,000
    • Bed Width: 102"
    • Deck Length: 40'
    • Deck Height: 34.5"
  • Frame

    • 14" I-Beam Pierced Frame
    • 3" Channel Crossmembers
    • 16" On Center Crossmembers
    • 4" X 1/4" Flat Frame Bridge
    • Torque Tube w/Sway Control
  • Hitch

    • 2 - 5/16" 25,000lb Adjustable Coupler
    • Safety Chains & Hooks
    • Breakaway Battery Kit
    • Hydraulic Jacks
    • Spare Tire Mount
  • Axles, Tires, Wheels

    • 2 - 10,000lb Dexter Oil Bath Axles
    • 6 Leaf Slipper Spring Suspension
    • Electric Drum Brakes Both Axles
    • ST235/80R16 Tires
    • 8 Bolt 16" Silver Mod Wheels
  • Exterior

    • Powdercoat Paint
    • 2" Treated Pine Deck
  • Ramps

    • Hydraulic Dovetail
  • Power

    • 7 - Way Plug
    • Rubber Mounted LED Lights