Rare occurence during assembly as they use jigs to hold everything. More likely was when the driver stacked them and got overzealous with chains, binders and a long pipe distorting everything. If its new I would take it back. If not a body shop with a frame machine can get it straight for you. Slight adjustments can be made by measuring and sliding the axles on the leaves. Assuming you don't have torsion axles.
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