Seeing as you live in the PacNW, spray-in is the only way to go. I used a carpet liner in my old truck, and even with a canopy I had a lot of moisture problems come winter (mind you, it was an 89 Dodge Dakota, so I didn't really care). The spray-in will last you longer, and like Tech said, you can always put a carpet scrap over the top of it to make it more comfortable for camping.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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