Ya know, we were so ignorant about weights such as: gross combined weight rate etc. that we just put it on and went. It rode very smoothly. I think a lot of the stability came from the dual rear tires. We were also careful of "center of gravity". It was a 9' 6" camper with a queen bed overhead. We also pulled 8,000 lbs of horses including hay and tack. I'm sure we were
way over our load rating; but didn't know better. The dealer told us it could carry 10,000 lbs and pull 10,000 lbs and we took him at his word. Plus there were tons of other horse people going down the road with the same set up.

My son took the camper when we sold it and he has a single axle Ford 250 4 wheel drive. He added air bags in the springs and that seems to help him with stability, I don't think it does much for increasing load bearing.
If you are looking for a solid sided camper with a bath, kitchen, A/C and all the other creature comforts, it's hard to find anything that weights less than 3,000 lbs.
Marsha~