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Michael: Liquid weight in tires is nothing more than a tool or attachment you add to a tractor, and like any other device it requires care and maintenence. Leaks must be attended to promptly, it's best to jack the rear wheel every 6-7 years and change the screw in valve stem. Do this with stem at top, thus you shouldn't loose any liquid in the process. It's best to take these to a tire shop for changing, as most can pump the fluid quite quickly. I remember once asking tire shop to come with mobil and do it on farm. They came with new tires and tubes, never even removed rear wheels and they were gone in two hours. Some folks will tell you to buy equipment and do it yourself. I've heard some of those equipment discriptions, would probably take 4 days. If you buy equipment like my tire guy, it would be costly. Just a great job for the PRO'S. I question the value of putting liquid in front tires, just not enough bang for your bucks. Calcium chloride is still your most economical liquid of choice. There are 40-50 year old tractors out there, same rims, because the maintenence was done. Your question on transmission, yes excessive weight will create problems, but it's not liquid filled tires plus a couple of factory wheel weights. We've all seen these photos of cast concrete weights that filled rim center. I wouldn't worry about transmission unless you add enough weight to double weight of tractor.
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