They are a great product!
If you have much crown in your driveway, a third one in the middle of your bucket is a good idea.
I had a member on another forum recommend that I move them in about 10" from each side of the bucket. I think that might be a wise idea.....
I read on another thread that someone put them on their snowblower. Does anyone have any history with that? With my gravel drive it sure would be nice if that were true.