Snow won't hurt anything. Once it snows it covers the roof and protects it from UV damage. A thin piece of fabric between your roof and the snow won't do anything. In my storage lot I've seen lots of trailers with loose, poorly tied down covers flapping in the wind. At some point they will rub a hole in the corner of the roof. No covers for me. My last park trailer sat on the same site uncovered for 10 years. Snow was never a factor....Don