I once had an old boat that I was going to mount a new motor on. The wood under the aluminum skin in the transom was getting soft, and I was not sure it would hold. I went to a local welding shop, and had them make an aluminum bracket the folded over the transom. It distributed the weight of the motor, and worked well.
Point being, you could probably have something similar done with your camper, maybe a folded diamond plate that runs along the sides of the camper, with the lift brackets attached to it, something that will distribute the weight.
Larry