I have a black plastic rain cover over my bedroom vent, so I do not need a cover for that. I also have Sunbrella, blackout window covers for all the bedroom that my wife made for our trip to Alaska which I could use to stop additional heat from coming in there. I think that is probably overkill for the heat, but was great for sleeping.
In addition to these easy fixes, I am careful to regulate where the cool air is going into the RV on a hot day. Closing all the rear vents so that all the cool air goes into the living room really makes a difference. This are my quick, easy and cheap fixes to help cool my RV. I am sure there are others out there that you have thought of that would help.
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