I saw these custom removable window sunscreens over in another forum. Thought they could work for some of the Escape windows (not the frameless) for the warmer climates. They were custom cut, installed with toggles for a reasonable price of $330 for 6 windows.
If a person had those toggles installed they could maybe serve a second purpose in cold weather camping. Replace the sunscreen material with an padded cover to insulate the frames in cold weather and cut down on condensation. Or replace the sunscreen material with sunbrella material to cover the windows for those that don't use a trailer cover. Actually the sunbrella material might just do insulating as well. Just thinking out loud.