The earlier LTX version came on the 2005 Plateau. We replaced all 5 of them due to age last year, the tires looked fine to me, lots of tread left.
I also have them on a Chevy Duramax PU as well. Living in the American River Canyon, always turning, not to much Hwy. time they didn't do as well, but no tire I have tired will last over 30K here. Michelin did prorate so the replacement on the truck is very inexpensive. FYI, Americas Tire in Folsom has them fairly reasonable.