Ceiling Vents Open During Storage ??
Just a couple of words of advice....the first from a dealer repair tech....you should leave them open just a crack during storage as humidity can build up on the ceiling...like the one guy said....it's like roof vents in a house.
The other thing is, I had mince open during winter storage about a couple of inches and had the extra dome vents on. Well....I hadn't realized that the extra dome vents were 5 or 6yrs old and the plastic fins had deteriorated from the sun so they were brittle. They were brittle enough that a squirrel broke thru and then broke thru the screen, but I guess it realized it couldn't go much farther without falling, as all I could see when I opened up in the spring, was the little footprints on the ceiling and a busted screen. Luckily it didn't fall in and wreck the place.
So now I leave it open just a hair and checked my extra dome vents yearly.