When I did a bit of commercial snow remouval with a 4 x 4 GMC 3/4 ton I'd want to get the job done ASAP.
One drive went between 2 very large outcroppings of bedrock just wide ecough to clear the 8ft blade.
Needed to widen considerably just past the outcroppings in order to have 'turn around room'.
I was pretty good at the fast foreward/backup/go again required to do large areas.
But one day after a wind blown 18" dumping (every thing was kinda blended in), because I pushed with the blade at angle, the front shifted sideways and so when I backed up I smacked into that HUGE imouvable mack truck sized rock, hid the rear window and demolished the rear end!
Totalled the bumper and PU box corner.
The replacement bumper became a 5" X 3/8" channel.
At a later date even that channel had bent corners.
No matter how experienced you get at plowing, these things happen.
Ever look at a current year model PU after a season of contract plowing?
They look as if they just came back from Iraq or Afganastan!
Guys tend to take on 100-150 driveways with the one truck-no wonder.