Safety Mod Pass Through to Truck Window

Kayteg1 wrote:

HMS Beagle wrote:
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.

But if I understand what your semi-rigid design does is hold to one side and rub against the other.
Even glass can take rubbing from foam, I don't like the idea of rubbing. That is why I think very soft foam, or inflatable is the way as they will flex without rubbing.
The main issue IMHO is that you have to attach corners forming the square and the swimming pool floats will be hard to do that.

No - this is soft urethane foam. Each side stays stuck to that side and does not rub. The motion is taken up by flexibility in the foam. Polyethylene foam would be too rigid in my opinion, and styrofoam way too rigid. Basically I made what you can buy from Northstar, but without the vinyl covering, and to fit my window opening precisely.

With polyurethane upholstery foam, you can cut pieces and glue them together with spray contact adhesive. It would be more durable if covered with vinyl or some fabric, but mine has held up for several years now bare.