With my truck and camper combination, I initially started out using the standard rubber bedmat. Twice my camper slapped my roof when at highway speed going over what I describe as whoop-dee-do’s. It did no damage but I was not going to deal with that situation so I went to Tractor Supply and bought a 4×6 horse stall mat on top of my regular bed mat. I believe they are 5/8ths of an inch thick.
Since then I have not had any issues at all. The 4×6 mat fits perfectly with the base of my camper. I am running a 2017 Ford F350 CCSB and my camper is a 2017 Northern Lite 8.11 SE.
2017 F350 Super Duty 4x4, CCSB, XLT Premium Package, 6.2 gas, 3.73 rear end, GVWR 11,300 lbs, Payload 4226 lbs, Silver Ingot, Camper Package, Split bench front seat, Upfitter switches, LED Box Lighting, Rear Step Tailgate, Air Lift 5000 Ultimate Airbags with Air Lift WirelessAIR on board compressor kit and remote, Torklift Upper Stableloads, Torklift tie downs w/ Fastguns
2017 Northern Lite 8.11 QC SE