Cupping/shaving inner portion of tread on drive tire

I would say you will find nothing wrong alignment wise, still good preventative regardless. Rotate them if you like, that may help also but most likely will not. I say it's the tires. If you look at the front drive it's starting to do the same just not as bad. Get the life out of them you can and pick a different tire next time. I have seen this tread on other trucks and they never look smooth and flat, always chopped and uneven.

JMHO

 

Alignment Specialists does a good job. They're just west of the Flying J on 2100 South.

 

MD Alignment did this truck. Its smooth with no pull, no uneven tire wear and no issues.

While I know Mr. Super Trucker himself KR recommends them, the owner of MD knows his stuff.