Interesting discussion on that link, Raycfe. We used to have a Viking Legend PUp that was kept outside year-round under an ADCO cover and never had a problem with dampness. We live in Georgia and the humidity is moderate in the winter (not too much snow), but the sun would shine most of the day on our camper and then chill down late afternoon and, of course, colder nights. That would have meant temp changes that would affect condensation; however, we never had any mildew or dampness problems. Now we have a TrailManor that is garaged offsite with only temp changes but no outdoor effects. Never any problem with this one either.

Perhaps dampness is more of a problem with RVs and TTs that might have less open areas compared to a pop up. I am thinking this might be the cause of interior humidity issues since there is less air circulation/venting.

When we lived in Florida (didn't have a camper then), my MIL used to keep Damp Rid, sitting in a dishpan, in her master closet and she had to empty the water from the dishpan every 2 weeks!