I do all the same with the foil when our Axis is in storage: Have 3 big pieces for the front 3 windows, cut up the small piece for the skylight above the shower and put the same foam "plugs" in all the hatches.
I've found that the industrial velcro doesn't hold so well when the RV gets hot (this is in storage so the A/C isn't running). Thus all my attempts to use velcro to hold the foil on work for a few days. My shower skylight cover always falls off now.
My goal for storage, though, is a little different: I'm not trying to keep the heat out I'm trying to keep the UV out. Keeping the UV out will help to prevent the interior fabrics, trim, etc. from fading over time.
I don't use our Sunguard while in storage because I don't want that to deteriorate that quickly either--we use it extensively when camping though.
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