Cheap way of loading tractor tires with windshield fluid. We all need more ballast for tractors. Yes, I know this is not the heaviest fluid. But it is cheap, and you can do it with the tire on the tractor. If you choose to take your tires to be fille, understand they will come back sometimes a thousand pounds heavier. Each of my rear tires now weighs about 300 pounds. That would make these tires difficult to install. It would only be worse with a larger tire on a larger tractor. Windshield fluid