By using the off road example, I was only trying to illustrate the action of a trailer with a raised center of gravity. Such as the OP and I were dealing with. When I say sway, I don't mean the rhythmic side to side action. Proper hitch weight and an adequate rear suspension are the cures for that. Rather a one time rapid weight transfer. It's been 50 years since Physics 12, and I only squeaked by then, so can't give you the proper terms. Instead of swaying side the side to the music at the dance, you fall over on your side.
