#3 I'm guessing this blower wouldn't be good on a driveway with all stone?
We would not recommend single stage snow blowers for use on gravel driveways. For that application, a two or three stage unit equipped with tracks instead of wheels would work best, as they will have an independent height setting to lift the shave plate off of the gravel. If a track-driven model is not available, standard wheel versions will work as long as the skid shoes are raised to separate the shave plate from the gravel