You didn?t say where the cupping is, front or back.
The symptom is the cupping,
Usually the cause is something loose. If the back, could be someone tightened up the suspension in ?droop?.
Solution is to find what is loose, worn tie rod end, ball joint, shock or bushing on the front. On the back, loosen the suspension struts and retorque when wheels are carrying the vehicle weight. Also check shock, bushings etc for slop.
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