There is a man at the door whos sole job of the day it to chip ice. Trucks have been set to have a much reduced plugging effect and acceleration is set way down also. When operators are watched they treat the trucks like angels. When left to their own devices who actually knows. Tires are being chunking out. These trucks preformed well on the Main brand tire they used. As it is no longer available we are desperately searching for a replacement with a like performance or at least close. A tire is only lasting a week or less. They used to get a month or more. The Maine tire was a soft compound. We have tried some form of organic material and poly I will see if it was walnut shells.