Short video on weight distribution

I saw truck trailer combo that I wished I could have videoed as a demo. It was a 1/2 ton truck pulling a small trailer with a Harley on it. The bike was to far back on the trailer, and the trailer was tongue up. Anytime he got above probably 45mph it would start swaying, and it was throwing that truck all over the road. I never would have believed a trailer that lite could have wagged the truck that much, but he could not keep it in his lane.