I don't think jacking would bend them it the direction to cause wear on the inside, more likely the outside. Toe out or the top of the tire tilted to far in, problems at the hub/axle weld or spring/shackles? I think the axles are arched a little bit, if so it could have rotated a bit in the clamps although there may be pins in the spring [broken?] to prevent that. This is all guess work of course. Good luck in finding and repairing the problem.
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