Jim, I had the same fast tire wear on my RAM 2500 front axle. Come to find out the so-called ‘expert’ toe in job i had done was way, way too toed in. So, I found an actual guru of alignment who did the trick. The Dana 60 front axle should be at approaching zero toe in: 2/32nd of an inch. I would take the truck to a true alignment guru, which is hard to find, to see what is happening. Explain what load you carry and how you use the truck, because this all makes a difference. I think Geno’s Garage has a chart for different axles.
2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.