Yeah, I would have wanted my trailer to look like this if I didn't cover it...
I've covered my trailers for the last 15 years (I didn't do it the first couple of years I first owned the old Prowler..)
Well, when I traded in that old Prowler for the new Rockwood, it was in such good shape that I got a very good trade in for it. Actually, about 3 times what I thought they would offer...
Anyway, I've never had any mold on the trailer. Just the cover has the MOSS on it! It does not trap moisture. In fact, the cover dries faster than the ground around it after it rains..
I've had the ADCO covers over this time and they have been great for me.
I can't think of a reason not to cover mine when it's out of season.. I don't cover when I'm using it during the summer, but when I winterize it, the cover goes on.
Good luck! Mitch
2013 F150 XLT 4x4 SuperCab Max Tow Egoboost 3.73 gears #7700 GVWR #1920 payload. 2019 Rockwood Mini Lite 2511S.