just throwin out a thought here , anyone ever tried usin a chunk of cement wire under there rubber floor ??? my brother put a chunk under the mat of his his mid 70's pick up he had yrs ago he bought new with a rubber mat ...the wire kept the mat up off the floor to let condensation wick away ,it wasnt a sound deadener bye anymeans but the floor of that truck here in PA were we get nasty winters stayed really nice for many yrs.