Just read a post somewhere (might have been on another site) about those covers. Seemed a lot of people complaining they didn't hold up very well. I'm in PA, so we have about the same winter weather. I didn't get to cover my TH this year, as they didn't return it until December, and then it had to go in for more work in Jan. I used to cover my previous fifth wheel with those tarps. I know everyone tells you not to, but I never sealed the whole thing up, so "breathing" was never an issue. Only had the tarp come about half way down the side, covered the front and back was mostly open. I was more concerned with keeping crap off of the roof, gotta wash the rig at the beginning of the year anyway, so anything that got on the walls was no biggy to me. Only thing you realy have to watch is those mmetal rings they put in there, gotta make sure they can't bounce around in the wind and hit the sides of the trailer. Oh- one other thing- if you ever go up on the roof with one of those on ther, HANG ON! They are very slippery when wet!