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It makes more sense to insulate you than the whole back of the truck. Get a foam pad to put under your sleeping bag. You say there is a plastic liner, but a real sleeping pad should insulate much...
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#1: Attribution notice removed
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System
·
2020-06-03T15:54:24Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/17031 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/