For all that have a memory foam mattress on a solid surface, check underneath for mold. Your bodyheat and sweat can create a perfect enviroment to grow mold - no roof leaks needed. Especially when winter camping with condensation.
This seems to be a remedy
www.hyperventmarine.com

old thread but found this product: Cedar Breather

mentioned in this Forest River Forum.. ...

anyone have any experience with this product (s) or other remedies for under mattress condensation.. (if a problem..)..?



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Any additional experiences out there, of recent..?

another product..
and a video about it...

DIY Hypervent article.. mentioned in first post..

funny, while searching, we found a citation from our neighbors in Nor Cal from several years ago, who also did an article on Hypervent..
small world sometimes...

or another solution, build a pallet style frame within the confines of your current bed platform. might be an engine compartment access problem, however.. maybe a bed lift mechanism added..