As the case with many threads, my take little different. Like yourself, we're also here in PA. We camp into December and start back up the last week in March, just about when the freezing temps at night cease. Our previous hauler remained outside all the time, even through the snow. I've always used an ADCO Tyvek cover. This is the highest line made by ADCO. Prior to covering in December, I clean the unit spotless both inside and out. In March when I uncover, the unit is as it was when I covered it up. I have no streaks from rain or melting snow and I have no spring cleaning to do. In general, good covers are expensive though. Currently we are getting ready to special order an ADCO cover for our new unit. Putting them on and taking them off however, is not a job for the weak at heart, it's a job. I always get someone to help me. Happy shopping.