I saw a guy at duck camp once with a ball on back of his pop-up,
asked him what he pulled and he said flat bottom jon.
But I sure would be nervous about it other than real short trip and real
slow. I asked around a lot before I got my slide-in, about towing behind
campers, and was told by numerous folks that it could be done behind
a fifth wheel, but was a no-no with two bumper hitch trailers.
Just what I was told