Interesting I have been considering building a trailer for the exact same purpose. What I have come up with so far (in my brain) is a "trike" with a centre mounted hitch (in preference to cargo type basket at the rear) designed for carry 40/50% load then the rear trailer axel to support the other 50/60% of the load. I have carried some large loads behind bikes and would agree with the idea that if you tried to carry 400kg (1000lbs) behind a two wheel bike the inertia could simple push or pull you over if a large bump was encountered. I have visions of caring up to 5x 240ltr Sulo 240Ltr bins. With the above design I've been informed that for a well made 20/24" wheel it should carry 100kg each wheel. This broken down equates to 100kg for me an bike. 400kg for load. Will keep posted.
