I have never heard of putting liquid in the tires. This just seems odd to me as well. It wouldn't be hard to add weight to the tractor if you had a welder. My father made his own weight once using chain to suspend a big piece of iron from the trailer hitch. It can be done with a little creativity. It would seem a lot easier to unbolt a weight instead of having to drain the tires out. Liquid doesn't compress so I could imagine the ride being rough.
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