Looks like I have the recalled 6 tons. Always thought the teeth looked a bit wimpy next to the little 3 ton ones. Had them for years. Usually never went under the car with them any higher than the lowest setting anyways. But I have used them set up several notches while swapping coil springs which definitely causes some shifting around. 2 or 3 years ago I made some wood stands with 2x4s and 2x12s so I just jack it up and put the tires on those if I plan to be underneath the car. Don't really see many situations where I'd need to be underneath the car while the suspension is missing anyways.