I was just out looking at the old Hilton and it looks about time for a snow removal, there's about 8" of some rather compacted stuff on top, right now. If I leave it on all Winter, the ceiling inside will start to bow. In the Spring, when it melts, the roof will expand back to the original. Still, it takes me about an hour to move it off and clean the solar panel so I'll suck it up and get it done.
I don't climb on roofs or platforms of any kind in the Winter, anymore. That is for young guys with fast healing bones and such. I work off an 8' step ladder and I use my modified roof rake that makes it pretty easy. The roof rake has a set of small wheels I added on the blade of the rake so no metal comes in contact with the roof. About a dozen or two pulls and the White Devil is gone.