I have a 06 E350 super duty 12 passenger 6.0. The tires Goodyear Wrangler PROGRADE 245/75-16 are wearing out in a strange fashion. With only 6,000 miles on them (MI to soCal, and roundtrip SoCal to Denver) I've noticed that the rear tires are noticeably shallower on tread depth.
This is my...