Our T-2499 lives in northeastern Indiana. I"m sure we don't get the heavy snows you get, but we are exposed to "lake effect" storms that are serious enough. Aside from brushing snow off occasionally, we've never done anythng special for our rubber roof and it remains watertight. This was true for our other units as well. Of course common sense applies here: if you get a big storm that deposits a couple feet of snow on the roof, you'd want to get all that weight off as soon as possible. Otherwise, my experience suggests there's not much you have to do for snow as long as your keep the roof well-maintained.
I've heard where some folks will seal off the roof units of the AC. I don't do this, but it sounds like a good idea. Does anyone do that and how is it done?
2005 Sunline Solaris SE T-2499
2006 Chevy 2500HD D/A