Just when I was beginning to think I had seen everything, something new comes along.
What I did see for the first time this spring/summer is travel trailers on the shoulder and in the ditch, with and without their tow vehicles, on their sides, literally destroyed, looking like a tornado had just turned them inside out. As I recall, the one with the most damage was still hitched, or attached, to a pickup truck still on its wheels. Apparently no one was hurt, but it must have an eternity of sheer terror in the tow vehicle until everything finally stopped moving. And, I'm sure that in both these cases, the owners had begun their vacation confident in their knowledge and abilities.
There is no way this should be legal...too many axles, too many tires, too much moving weight, too many opportunities for unexpected forces to result in dynamic instability, too many things that can go wrong. I would have a couple of bicycles, a moped, or unhitch the truck for errands.
I had the perfect South Park video clip for this post, but this subject is too serious for it. :|