There are several portions of this instructable, so I'll start with an overview of the steps and the parts of the trailer.Main body:
the body of the trailer is a plastic bin with a lid; I used an Akro-Mils Nest & Stack Tote (NST)
Model 35300 (29 1/2 x 19 1/2 x15)--I bought mine at Grainger
. I like it because it is pretty intrinsically strong and stiff. However, I think this plan can be adapted to most plastic bins.Wheel mounts:
the wheels are mounted to metal brackets on the sides of the container. They are adapted from brackets from Home Depot, with some cutting and drilling.Internal Structure:
the plastic bin is not strong enough to support the wheels (ask me how I know), so an internal frame is needed to hold everything together. It connects the wheels to the bin, and the bin to the trailer connection.Hitch (trailer side):
to connect to the rear wheel hub, the hitch needs to take a right angle and come in at roughly 45 degrees to the axis of travel. Therefore, when you make a turn in one direction, the hitch comes in roughly parallel to the rear wheel. There is a flexible coupling (rubber tubing) to allow turning. The connection to the rear wheel is made using an air hose quick-connect.Hitch (bicycle side):
the connection to the rear wheel to the trailer is made out of a metal bracket with an angle that matches the hitch, which remains semi-permanently in place on the bicycle (you can remove it, but you will need a wrench). It doesn't add much weight, so I leave it on all the time.