I hope this question is a good fit.
I plan to replace the leaf springs on my '98 Ford Ranger. It is recommended to use 12-ton jack stands in this YouTube video. The truck is only, at most, three tons. Why 12 tons?
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I doubt it's got anything to do with the actual weight of the vehicle.
The 12-ton jackstands (20-30" lift) are taller to begin with, and go higher than (for example) the 3-ton stands (12-16" lift). If your vehicle is very tall, like a 4-wheeler, you may need a taller stand to even reach the lift points at the stand's lowest setting. If your lift points are higher than 12" off the ground, the 3-ton stand isn't gonna do you any good!