They worked extremely well for us. Prior to our current TT we used to have a Fleetwood popup and summer camping in Florida was an issue for the air conditioner, it just couldn't keep up. The bunk ends were extremely hot mid-morning on until the sun went down. We purchased these solar blankets from PopupGizmos
and, in our opinion, worked as advertised (same concept as putting up a windshield sunshade inside your auto, it reflects sun light). Having these things on made quite the difference.
We did install/remove the blankets every time, so yes it was somewhat of a PITA.