Besides what everyone else is saying about pulling in the sides to keep them lubricated, here in Michigan the Home Depots, etc. sell a snow shovel for roofs that come on a very long extended and retractable pole. If I were ready for fulltiming, I know my unit would have one. You could periodically from the ground scrap/remove any accumilation of snow easily, ROOF TOO!!!! (or at least from the immediate sides of the roof without having to go on top) Would also help prevent ice build up from the melting snow!!!
Brrrrrrrrrrrrrrrrr, all this talk, I think I'm gonna go sit in the hot tub for a while!