Most likely Mennonite, not Amish. The Amish do not use anything with electricity or gasoline or diesel engines. The Mennonites do, and they usually convert all of their tractors to steel wheels. The Mennonite farm where I get a lot of my produce is run by a large extended family, and they have at least 5 tractors that I have seen that all have steel wheels, ranging from a Case 444 garden tractor to an old Farmall Cub and various sizes in between.