I am on my 2nd set of Michelins that have sidewall cracks at 3 1/2-4 years respectively. Michelin offered some compensation on the previous set. Now I am at less than 4years with cracks. They will be the last Michelins on my coach, to only get 4 years out of a "premium" tire is ridiculous. Probably Toyo will go on, but am also looking at Continental and Bridgestone.