My 2015 Toyota 4Runner build

Please do! Especially in cold temps. Last weekend it dropped below 20F in the Sierra and the foam hardened up. When it finally collapses and forms to your body it will leave a depression for a couple of minutes if you move. It was like lying in sand at the beach. lol

Well we got to use the new mattress and it was so nice, even in the colder temps! There were several night it got down into the teens and never got hard! Did some checking its not memory foam!
 
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Smart place to put it. I've only seen it in the gas cap compartment.

Saw some guy do it on You Tube and thought if it is submerged there, then I’ve bigger problems than just messed up diffs!!! LOL