Step 2: Making a flat-bed trailer

Picture of Making a flat-bed trailer
The key to this project is a simple bike trailer with a flat wood bed that you can bolt everything to.  Keeping the trailer simple makes it light weight and easy to make.
  • You can get a commercial bike cargo trailer for this project, or you can make one using one of the many Instructables.  I bought a basic bike cargo trailer from Sears.com, the "M-wave trailer" for $200.
  • Most commercial bike cargo trailers like the one I got have a fabric or plastic bed which isn't strong enough for our purpose, but can be replaced with a wood bed.
  • Several of the "how to make a trailer" instructables are easy to put a wood bed onto if you choose to go that route.
  • If I was doing this project over again I'd probably start with the Wandertec Bongo trailer which looks perfect for this project without any modifications.  It's the only commercial trailer i could find with a flat wood bed.

Working with the M-Wave trailer (see photos below):
  • Remove the side-rails
  • Check the fit of your speakers on the trailer bed.
  • Unscrew the plastic bed sheet from the trailer frame
  • Use the plastic bed-sheet as a template for a new wood bed.  Just trace the outline and screw holes of the plastic sheet directly onto a piece of 1/2" plywood and cut out the plywood with a saw.  I added about 4" extra wood at the rear of the tralier so my speakers would fit on.
  • Paint the plywood so it will be waterproof
  • Screw down the plywood to the trailer frame.