In a word 'condensation' .
It is amazing how much us humans exhale 'condensation'
during our sleep.
It will condense on the cold surfaces and being that the slide wall is not exposed to any 'air movement' (trapped by the mattress and sheet) it would collect there.
If possible place something between the mattress and wall to hold it away from that cold surface....something like 2 shallow plastic containers ...not cardboard.
Only need a couple of inches to allow for air movement.
Also... crack a vent ...this will help also.
Hope this helps
Islander
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'07 WildCat 30 RLBS ~ West Coast Edition ~ Trail Air - Tri Glide Pin Box 2000 F350 Lariat DRW 4x4 7.3 Diesel 89k miles Edge programmer, 4" SS exhaust turbo/back, Tru-Cool Max Trans Cooler, Bilstein Shocks Vancouver Island, B.C., Canada
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