Snow white - but snow weight? (How much on roof)

Home improvement centers sell roof rakes specifically designed to "pull" snow off a shingled roof of a normal house. They offer a long telescoping or sectional pole with a light weight head that supposedly is safe for a shingled roof. With it you won't pull the snow on yourself. You won't be able to remove it all off a flat RV roof but enough to make a big difference. Just be careful with your roof vents & antenna. Maybe the rake will come in handy one day for your regular house too.