Misaligned spindle on the axle is the most probable reason. Occasionally the spring hangers have been welded on improperly. Measure from front to each hanger and then measure from each front corner to the opposite hanger, in an X pattern. Measurement should be within about 1/4".
Alignment shop is your best bet.
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2016 Duramax - 2010 CF30SKP
Viet Nam Vet 70-71 Da Nang
Real airplanes have two wings and big, round, engines
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