I don't clear snow for pay but I have my own 550 foot driveway to contend with.Usually the rear blade on the tractor does the job.6" of powder is not a problem but a foot of wet snow is.In that case I fire up the dozer,nothing stops it.If I can't push I can walk over top of it .
I will say though that in the 10 years I've been at this place I've yet to have to use the dozer.In a previous location,former wife etc. ,the dozer got quite a work out every winter.The problem is the dozer really doesn't care if it's shoving snow or gravel.Then you spend a week in the spring raking all the gravel back into the lane.
As I type we have at 4 inchs of powder, possibley up to 8 or 9 total on the way,depending on the storm front pattern.