Regarding RV windshield and window shades, try looking in Amazon using this search argument, "rv windshield shades". There you will find both interior and exterior shades. I prefer shades on the exterior of the windshield and windows to stop the sun's heat before it enters the coach.
Another idea, depending upon the thickness of your wallet, is Magne Shade. These are held in place on the exterior of the windshield with very strong magnets. Unlike the snap-on exterior shades we have, the Magne Shades are mounted from the ground using a telescoping cane to lift the shade up to the pre-affixed magnets located on the inside of the glass.