Need advice on spacer between camper and truck bed?

Punomatic,

How did the rubber bed liner work out on the foam, longer term? Did you use spray cans from some place like Home Depot, do you remember the exact name/type?
I have just gone from foam panel with 2x6 on each side to a more solid foam core with out the 2x6 framing. I haven t tried the stronger foam core panel yet.