Front tires on my PSD are 30,000 mile tires, I don't care WHAT the manufacturers say. With 4wd, the weight of the diesel, turning, the majority of braking and cornering they just don't make it. Now the rears on the dually will last close or up to the mileage stated by the manufacturer.
The problem is the dually rears wear square and the the fronts "roundoff" so you really can't rotate them well. The same tires on the rear are perfectly "squared" and the fronts are wearing like in a more "rounded" fashion by 10,000 miles. If at 10,000 you rotate front to rear the difference is obvious. Rotating 6 or 7 tires is a pain and I am not doing it every 5,000 miles which would be about every 2 1/2 months. You need to take 4 of them off the rims because the rear inside rims aren't finished. No way that's happening even every 10K
I have read posts from many people and it seems they rotate the fronts side to side, leave the rears be and go for front replacements at a 2 to 1 ratio.
My current tires Continental Contitrac SUV/LT are 80,000 mile tires, not cheap and done at 30,000 just as my Generals lasted before them.
Retreadable tires may have place for me though. The price for XPS is high but recapping the 2 fronts and throwing them on the rear might work. I could then recap the 2 "new" fronts and swap once again. Moving the "square" wearing tires fromt he rear is Ok, it's trying to rotate fronts out that doesn't work.
P.S. I have tried every inflation pressure with little change in the front. They are at or close to max but the outside still wears quickly. When they were set lower the outside tread vanished. Rears are at about 45lbs whe unloaded and wear fine.