I wonder my tires that started weather checking at 4 1/2 yrs were 2010 year, and they were under warrentee, I had 5 year on the 315s my buddy's on his winnabego elipse were smaller but also 2010 and his were bad also He had a factory 7 year warrentee maybe they have had to replace allot of tires under warrentee ? Maybe 2010 was a bad year for them