When I first bought my motorhome it had Michelins on it. Way before 11,000 miles I noticed an uneven wear in the front tires starting to develop. I took it down and had the alignment checked and it was off quite a bit according to the guy running the machine. So he fixed the alignment, we moved the front tires to the outter rear position and moved those up to the front, and we all lived happily ever after until the tires were about 7 years old and I replaced them all just because of age, not because of tread wear.