I may have missed this, but how old is the RV?
We had abnormal tire wear and found that the bushings and suspension parts were completely worn out, which caused a misalignment. Plus we had one spindle that was bent.
Seems like bent spindles are usually on the passenger side as sharp right hand turns can sometime result in hitting curbs and other obstacles. The axle are seldom bent, but the spindles do take a pounding and that's where the damage occurs.
We had greaseable wetbolts and bushing installed. Ended the tire issues.