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Is the gravel on the driveway what is referred to as "crush and run"????
It kind of looks like it. I would be afraid somewhat of chains on tractor tires destroying the gravel.
Maybe its just me, but I would be somewhat cautious of that. What about a commercial snow thrower that you can adjust the height off the ground with? Then you won;t have to worry about gouging up the gravel drive...
Jes thinking out loud fer ya.....