Our Michelin AT2 (245/75-R16 LR: E) are just a hair over 6 years old (when bought, the date stamp as 2 months from manufacture date). Early this spring, the front passenger tire was cracking along walls for ~ 7 inches, from tread up to rim edge. Now, we're at September, and 3 tires are side-wall cracked. The tires have 28,000 KMS on them, and have never been aired down for beach driving, and maintained meticulously (air pressure always checked early morning just before use, and topped up if needed). These tires have never seen "rubber protectant" sprays or gimmicks to shine them up.
In retrospect, i suppose we are satisfied with these tires (notwithstanding the low mileage before tire cracking). From anecdotal write-ups on the LTX Micheline genre, we will go with something else this time (Goodyear DuraTrac LR: E at 265/75-R16). They are ranked the #1 On-/Off-Road Commercial Traction tire in North America, with a very large sample statistic of 7.5 million reported miles/stastic. The #2 is Michelin XPS Traction (at 670k road miles statistic); and #3 is BFGoodrich Commercial T/A Traction (at 1.16 million road miles statistic). I had really wanted to consider Cooper AT3 tires, but there is a very, very low sample statistic on them, and what few reviews I could find were very up and down: a good cohort absolutely hated them, and a good cohort loved them: this s worrying to me. The LTX AT2 Michelin (the ones we want to replace) have a very low "would buy again" statistic, but are #3 in the all terrain category.
The only worry have on the DuraTrac prospects is: balancing. Some are having a tough time balancing LR: E grade DuraTracs. Of the Michelin tires we have now, only 2 needed any balancing weight whatsoever (!)