We store ours indoors for the winter. We know people that store outside that go out and using a push broom brush off the roof if the snow gets too deep. I would worry more about ice than snow on the roof. I'm sure there are many that don't worry about it at all. I'm also sure there are some that wish they had worried about it before the roof developed a leak. I guess it all comes down to how much you are concerned about it and how much snow you get in the winter at your location.
Steve & Nancy
2005 Itasca Sunrise 33', W20 Chassis, Ultrapower, Henderson Trac Bar
2012 Chevy Captiva Sport AWD, ReadyBrute Elite Tow Bar, Blue Ox Base Plate, Protect-A-Tow