bike trailer plans from pvc. I have two of these I made one with lawn mower wheels one with bike wheels. It is my design so I don't guarantee your success with it. I think it will cost under fifteen bucks plus the cost of the donar bike at the thrift store. Mine was six bucks on half price day. It is a download file sorry too large to get on as a file.
simple bike plansrtf.rtf
Oh i forgot the hitch is an L bracket bolted to the tongue through the elbow. It seems to hold up pretty well but I would check it now and then to be sure. you might also want to add a triangular brace from the bracket back to the tongue to stiffen it some. A simple triangle of any thing would do.