We have the reflectix backed pillows that go into the ceiling vents to keep the heat out. Do you store you RV with the pillows still in place when storage is outside in full sun? Would there be too ...
I’ll be interested to read the consensus on this. I thought the vents were for leaving open in hot weather storage. Of course you need exterior vent covers. The hottest air will always exit if they are open. I would only use the pillows while I was running the AC. Fading from the sun seems a lower issue to me than allowing heat to build up unchecked.