I have a large piece of flexible aluminum sheeting that we use to cover the inside of the windshield.
Got this because our older coach has a slanted front end and commercially available reflectors just are not large enough to cover the area.
It works fine except it sags in the middle when in place.
I want to get a segmented plastic or metal strap that would reach from side to side (inside) to support and hold the reflector up against the windshield.
Much like the tension straps that I've seen used on the underside of awnings . Who sells or makes them.