Finally got to use the Frontier 72 inch RB I bought for my 4210, reversed the blade and angled it to the side and pushed back a foot of wet snow on my drive. Two passes in reverse gear cleared 200 feet of asphalt and I didn't even use 4wd.
Going to put a rubber edge on next winter, the blade edge does not mark up the asphalt but it sure chews up the grass when I don't raise it fast enough. Live and learn....