Flatbed Car Trailer

This plan is for a Tough, Heavy Duty Tandem Axle Car Trailer. Bed Size (4800 × 2000). The Subframe is of strong RHS with plenty of support using 7 Chassis cross members at every 600 mm. The Tandem Mudguards and component parts can be purchased at most trailer suppliers.

Included in this Trailer Plan
  • Drawings
  • Pictures
  • Part and cut lists
  • Construction tips
  • General advice
  • All in PDF file Format



With the plans, you will be able to build your own trailer, as there are so many options available with guard and side gussets, different mudguard shapes. Weather you locate your ramps underneath or standing up to give more ground clearance, and put the number plate on the back of the ramps.

Rear Slide out Ramps are just a start to this Flatbed Car Trailer, with the option of having them mounted on the rear so then it is a matter of pulling out a couple of pins and the trailer is ready to load.

A View of Roller Rocker Suspension being used in this Trailer, and depending of the weight rating required whether the use of single or dual axle Braking being used, also a good view of the underbody ramp setup.

The use of a full rear Mudguard Gusset allows the user to be able to walk along the side of the loaded trailer, also a support bar can be added to help to support the tandem Mudguard and allows the wiring to be placed inside the SHS and up to the Clearance Lights.

This Trailer utilizes Cross Members every 600 mm for maximum floor strength, as an option the Trailer can be fully sheeted to suit your needs.

Checker Plate or other steel sheets like Galvanize steel can be used to build the trailer sheet metal parts for e.g. Mudguards, inner guards and gussets.

This Trailer can also be built with a Tilt Drawbar to suit your needs

The plans conform to the Australian National Code of Practice – Building Small Trailers (VSB1). Trailers built to comply with this code of practice can be registered for on-road use in Australia


    Tandem Dual Axle Car Trailer
  • Bed Size – 4800 x 2000 mm
  • Chassis Construction – 75 x 50 RHS
  • Drawbar – 100 x 50 RHS
  • Roller Rocker Suspension (load sharing)
  • Ramps
  • Ramp Storage Under Body Holders
  • 45 mm Square Axles (1 Braked)
  • Tail Light and Number Plate Channels
  • Swing up Jockey Wheel
  • Spare Wheel Mount