Here are some pictures of the stereo trailer I built for some rides here in Knoxville. It uses a commercial trailer arm donated by a fellow cyclist. The platform is made of plywood and the axels are 1/2" threaded rod welded on one end and using lock nuts on the other. Body is made of polyster impregnated fleece.

The stereo is powered by a car battery and uses a car audio amplifier to push two 6.5" speakers. Signal is provided via an iPod or other Mp3 player. It isn't as heavy or as hard to pull as you might expect.

Total build cost was right around $200 but the trailer arm was donated and the car batery is borrowed from a cyclist who rarely uses her car in favor of riding her bike. I also already had all the tools and some of the stereo parts laying around my garage was well.

Pics:







It has a flat lid that covers the battery hatch but it wasn't built yet when I took these pics.