It is from condensation. One of the issues with TTs is that the area under the beds are all framed up and air/heat does not get under there. Often there is a pass through storage from outside, and the door does not seal tight and it is cool under there. Moisture is attracted to the lower temperature areas and condenses. Under the mattress there is no air movement so it just builds up, Best thing to do is find a way to add some ventilation, second option is to warm up that cargo hold.
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