Safety Mod Pass Through to Truck Window

There's a lot of movement between camper and truck - at least on my rig. With a similar shape and thickness, but using urethane upholstery foam instead of styrofoam, I have not had the thing move much over thousands of miles. You can see the cab and camper move, and the foam takes up the movement. Get some 4" foam, it cuts pretty good with a bandsaw or an electric carving knife. You can glue it with Scotch 99 spray adhesive.