My husband's work van had badly cupping tires at 44000 miles as did the second Ford Transit the company bought at the same time. One mechanic thought it was a bent axle, the dealership a bent frame. It now has to go to a body shop. There has got to be some problem with this vehicle. My husband's boss is making him pay for it out of his pocket because there is no explanation for the problem.
Source: personal experience.