You could always get an outside cover like the
Sunguard RV cover.
Here it is on ours:
From the inside:
(There are other brands available that go on a little easier.)
It reduces the incoming light by 94% with the advantage that the light doesn't have to come through the front window first. We've had it now for a season and it really does reduce how warm the front gets on those clear sky sunny days.
You do have to close the curtains at night though because the effect is reversed when its brighter inside the RV than outside.
We do use the foil when the RV is in storage though (don't really want to leave the sunguard out side all the time so we only use it when camping).
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