We added the darkest available window film on one of our trips to texas. It helps quite a bit but they had to cut the screen on half the window to get to that side so it is labor intensive -- well worth the trouble but not cheap. They also make a paint-on window darkener that might work on the outside although I'm not sure where you would find it.
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Frank
Former 2002 TM2619 Owner
2005 Toyota Tundra AC 4X2
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