How to Build a Flatbed Trailer

Written by steve smith
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A flatbed trailer is a great help when you have heavy things to move. You may be surprised by how much use this simple accessory gets. From helping a friend move furniture, to picking up large antiques, it's going to come in handy. It may save you money on delivery fees for furniture and appliances.

Skill level:
Moderately Challenging

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Things you need

  • Large plywood sheets 1/2"
  • 2x4 boards
  • 4x4 beams
  • Metal bender
  • Steel channelling
  • Axle and wheels
  • Trailer lights and wiring
  • Gas welder

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  1. 1

    Build the bed frame. A simple frame for a flatbed trailer has lengthwise 2x4 boards on a plank floor. Mount the frame boards to a sheet of plywood or connect them together by slatting. Use long wood screws or nails through the top of the plywood or slats. This mounts to the metal frame via four 4x4 beams.

  2. 2

    Design the metal trailer frame. To build the metal trailer frame, bend two lengths of channel steel pipe (square shaped steel pipe) in a metal bender so they join at a point in the front. The bends need to begin at the point where the trailer bed ends, leaving just the bent portion of steel sticking out beyond the bed.

  3. 3

    Weld the two points together with a gas welder, then mount a hitch ball plate to the top of this. Install the hitch ball by welding it to the plate.

  4. 4

    Strut the frame with more steel channelling. Cut pieces that match the width of the frame and weld them in place with the gas welder. The rear frame should be flush to the end of the trailer.

  5. 5

    Mount your axle bars under the frame using the welder. Measure the total distance of the frame, then find the exact centre. You will want to generally mount the axle back from the centre of the trailer bed about 10 to 20 inches to compensate for the A-frame.

  6. 6

    Attach the flatbed to the trailer frame. Mount 4x4 beams to the trailer frame by drilling through the steel with a carbide bit and anchoring them with bolts. Now, attach the plank frame bed to the beams using heavy duty anchor bolts or a similar method.

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