The first dually pickup I owned came with fifth wheel hitch rails in the bed from the previous owner. It also came with a rubber mat in the bed with cutouts for the rails to poke through. I found that 5/4” treated deck boards were just the right height to allow the camper to clear the rails.
I attached them to the bottom of the camper, and also had the smart idea to place two of them so they landed directly in front of the hitch rails. They acted as guides for the camper when lowering it into the bed, and prevented it from moving backwards while traveling.
The first one is new because I had just replaced it. The first one developed a long split.
:):)
