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The AirLift Road Tamer system is very much like what is on Volvo big trucks. It is not designed for a lot of uneven ground, I think the issues you raise are valid. The front of the "Z" spring is in a relatively large rubber bushing in the frame bracket so there is some give there. When you jack up one side of a drive axle to change a tire there is not much deflection at the "stress" points you name but the lift is only a couple inches and the axle housing is longer due to the width of the vehicle.
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Just an OBS pretty much stock
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