Before I left the frigid north I swept the snow off the roof of the MH 'every' day. A lot of damage is done when the sun comes out and it melts the under layer and then at night THAT freezes. Can cause a lot damage to seams, vents etc as it gets under neath and heaves them. So I sweep it off every day instead of letting it get thicker and thicker with snow.
The one thing I can tell you NOT to do is brush the snow off the cab over. I used the extended RV broom commonly found at RV stores. It has a big broad brush and soft bristles. So I thought it was ok to use on the RV..........well, come spring my cabover decals had feathered cracked edges.:(
The decals are cold and brittle in freezing temps and me brushing the snow off feathered the edges.