Camper / Bed Alignment Products - Do they exist?

I use rubber horse stall matting cut into about 12" strips - I set the perimeter of the camper on them to raise it a touch to clear the B&W hitch safety chain U-bolts that stick up in the box. The camper kind of bites into the rubber and the narrower strips seem to conform to the ridges in the bed - usually taking a "speed" bump cross threaded or traversing a gas station approach - will throw a "rock and roll" test at the system. Stays put pretty good.