When I don't think stainless steel plate will be gentle on the camper finish, I had vertical guides in the past and now have horizontal guides I pictured above.
Took my camper off after last trip and the fir shows pretty extensive rubbing on it, so I am thinking of going back to horizontal guides. They have limited guidance, so you have to get the camper within 1", but then they seem to work better.
For my rear guides I used ape wood, what is very dense wood and that seems to work best. I have some more scraps of it, so will try to use it on front as well.
The biggest problem I have on new truck is that the sides of the bed leave very small gaps, so I don't see final point where camper sets on the bed. Sometimes I have to squeeze phone camera in the gap to take a picture and see where it goes.
