This mechanism, first designed in 1994, has evolved slightly as the years have gone by to diversify its usefulness. Here is an image of the bike trailer itself. Made with a sturdy aluminum frame and a 2x4 stud going the length of the cart provides enough support for well over 100 pounds. This device also boasts an industrial strength hitch, while it may at times seem excessive in nature, such a hitch insures quality and long life use.
There is also a small aluminum frame that must be attached to the frame of the bike. This is done easily enough with the screw holes that come built in with almost all commercially manufactured bikes. Here is a sample image of such an assembly.
If you have any questions, or would like me to make one for you according to your specifications, feel free to e-mail me at sandmannalr@yahoo.com.