I have an ampeg 420 hlf and a 12 space road ready rack case. the rack is filled with goodies. for the time being i have a pickup truck. When I go to gigs/pracitces I put both of them in the bed (given it isn't raining) the bed doens't have a rug or anything, so it's just resting on the metal...would that damage anything over time? the cab has rubber feet that it lays down on, but the rack has nothing.