We'll be watching this thread (and others similar) too -- we have a spanking-new motorhome that's so far stored "naked," and the freezing temps are right around the corner here in western Washington. We plan on using it every 3 weeks or so for short weekend trips, as long as we can, and we're not sure how much to "winterize" it between trips... My first inclination is to get a good wrap/cover for it to help seal it up. We have a small heater inside, and the under-storage is vented to the interior to help warm it a bit (although heat rises, right?)....