Has anyone used studded tires instead of chains? If so did you by the tires with the studs in them or put them in yourself. I just wondered if they work as good or nearly as good as chains. I did see it mentioned in other forums but nobody really talked about the traction they provide. I was looking to put them on a tractor that my sister has I didn't really want to give her one of my chain sets her driveway is almost flat and there is weights on the wheels and I filled the tires.