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You can use mylar covered bubble wrap they sell at home depot to cover your rear windows. I have that with small velcro squares to hold it to the windows, and some brown nylon ripstop curtains that velcro to the rubber weatherstripping on the inside of the rear sliders. The rear window curtains are two layers of the brown ripstop, made em 5 years ago or so. I also made a double layer curtain for the rear window for privacy, held with velcro. I also made some single layer ripstop curtains for the rear door windows to put up when we do road trips. I put the mylar up about a month ago, and it has knocked down the cargo area temps by about 10-25 degrees. You can also use that mylar bubble wrap around your fridge or cooler too.
Park your truck in the shade and find out.it is true that it is more effective to cover the windows than the fridge, especially if the cover is outside, but not quite as practical unfortunately.
Let me see if these will work
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