4.8 Metre Flat Top Trailer

This plan is for a tough, flexible and versatile Tandem Axle Flat Top Trailer (4800 x 2400 mm), with the options for drop down Ute sides or drop in meshed gates. Also, the rear head board drops in and is removable as well as the posts for the Ute sides. The Subframe is of strong RHS with plenty of support using cross members every 700 mm, and a heavy-duty drawbar 150 x 50 mm.

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



This trailer can be made to suit Ute type drop sides with 2 or 3 sides, also can be made to have truck style drop in gates or you can have both, as the rear head board drops in as well. Just remove the drop-in Ute side posts, then drop the rear head board and high side gates and you have a completely different trailer.

This Trailer uses 3 Drop Down Tailgates per side with drop in posts.

With the plans you will be able to build your own trailer, as there are so many options available with different side gate heights, underbody tool boxes, and different gate hardware.

The same trailer with lift off side gates.

Tandem Roller Rocker Suspension used to carry this Tandem Trailer, the Brake and Axle setup will depend on the required weight rating needed.

The Rear Gate frame is removable for convenience, along with the rear swinging gates.

Many Types of Braking System can be used, such as Mechanical, Electric or even Hydraulic

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


    Heavy Duty Tandem Flat Top Trailer
  • Gross Vehicle Mass (GVM) of up to 3500kg
  • Weight of Trailer (ATM) approximately 900kg
  • Size – (4800 x 2400 mm)
  • 4 tonne Roller Rocker suspension
  • Breakaway System and in car controller
  • 12 inch Electric Brakes on all wheels
  • 4 Wheel 12 inch electric brakes
  • Drop down side gates
  • 45 mm Square axle
  • 1200 mm high drop in meshed gates
  • Chassis Construction – RHS
  • 3500 kg rated coupling
  • 50 mm Square Axles
  • Swing up Jockey Wheel
  • Spare Wheel Mount