We have had slide toppers on our last two trailers. If we get a new trailer we will have slide toppers on it too.
The time we had about two inches of snow on our trailer and was planning to leave that morning impressed me very much. The snow just fell off the topper as it came in. That was a lot better than it going into the trailer. I am not able to get on the top and push the snow off.
If the wind is blowing just right they will make some noise and after eight years our toppers looked kind of thin so we replaced them last year.