Hey Ray, I have a TT with a big back window like yours. It can get hot when in direct sun. I remember a YouTube you did a while back where you mentioned snapping on an outside solar screen to your big back window. Now that you've had it for a while, what is your opinion of it and where did you get it?
Here was the video update clip I did on the EZ Snaps Shades - https://youtu.be/Oigk2WHnrVs?t=1219 and the original review - https://www.loveyourrv.com/ez-snap-exterior-rv-window-shade-review-demo/
We are now back at our summer RV spot and I'll need the back window shade again soon as things heat up. The only issue I have found is 4 of the 3M snaps have come loose and fell off but that's out of dozens I put up. Mostly because I let it hang from them in the morning when I want the perfect view then put the shade in place for the late day sun. I have lots of spares though.
The shade material is still in great shape, almost 3 years now. https://ezsnapdirect.com/products/rv-shades/