An inflatable is ok in the heat. I throw a full size inflatable in the back of the PU for the occasional Drive in Movie. (Remember those) I used to have a water bed and when the heater failed the cold mass would suck the warmth right out of you. Just don't try to fill your inflatable with water in the woods. <img src="/forums/images/graemlins/grin.gif" alt="" />
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Enjoy your next trip...