Figure like this, You have about 1,000 pounds being focused on each of those 4 about 6 square inch surfaces. as long as the stands are of good quality, and on flat level ground, it would take a lot to shift them. Just set them no higher than you need and keep it level.
I'd be more worried about the stands sinking into an asphalt driveway (remember use something between jackstand and especially HOT asphalt) than I would worry that they could tip once weight is on them.
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