I think I might. Take a look at the attached tread depth reading. You can see that the outside tread of both tires on the rear axle are wearing fast on the outside tread. I replaced the passenger rear at 7640 miles with 5/32 (was about to drive 2000 miles). The driver rear is down to 4/32 with 10340 miles on the tire. The other tread readings on these tires and the front axle look good to me. Maybe camber on the rear axle? I need to decide what to do with that Driver Rear tire. The passenger rear tire has lost 3/32 in 2707 miles.
2013 Ford F-350 SD Diesel, 4X4, Crew Cab, Lariat
Sabre 2014 32RCTS, Pullrite Superglide 2900 18K