Like 2 separate run on Christmas lists!
Zero use for spray in bedliner if the truck is always going to have a camper in it. Toss a rubber bed mat down and you're set.
Maybe add rubber bumpers on front of camper? It's a given that the camper will slide forward until something stops it against the front of the bed. Depending on the length and location of the bumpers and the profile of the front of the truck bed, the bumpers "may" be useless, but a couple boards the right thickness across the front of the truck bed is a sure and common forward stop for the camper.
