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David, you are overanalyzing this, making a mountain out of a mole hill. Sure, safety is nothing to scoff at, but spending a week worry-worting about something as simple as jacking up the front end of a tractor is silly. First off, why TWO jacks? You only need one. Jack up one side, set it on blocks, then jack up the other. Second off, "tractor jacks" are not really useful for jacking up tractors. This is the giant heavy-duty jack that looks kind of like an old bumper jack out of a Ford car, right? Use a good hydraulic bottle jack rated for at least 6 tons. Sure, 6 tons is overkill, but the bigger the bottle jack, the more stable it is. If you jack up the tractor in the middle, the front end can pivot like a see-saw. The lighter side will go up, and the heavier side will go down. They're not always perfectly balanced. When you take one tire and rim off, it will definitely get lighter on that side, so the side with the tire will go down. Personally, I would jack one side up at a time, take the tire and rim off, then set it down on a stack of blocking or a large jack stand. Only jack high enough to get the wheel off. Don't jack it 2 feet in the air.
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