billyray50 wrote:
I used 4' x 8.' Pink or blue foam board from Lowe's or home depot with my last camper they was 3300 lbs with no issues.. Comes in different thickness. The one i used was 1 inch thick.
This is the best solution. This foam board comes in 1/2", 1", and 2" thicknesses and you can cut it to size with a box cutter. Never absorbs water the way any type of wood will do. No compression with a 3500 lb. camper in the bed. Weighs next to nothing so easy to remove if you decide to do so when the camper is not in the bed.
I put the foam board down and then a bed mat and leave them in the truck year round.