2013 JAYCO GREYHAWK Wheels Problems

I OWN A 2013 JAYCO GREYHAWK MOTORHOME ON THE FORD E-450 CHASSIS EQUIPPED WITH MICHELIN LTX M/S TIRES, LT225-75R-16. THE ORIGINAL EQUIPMENT TIRES HAD 26,000 MILES ON THEM BEFORE PROBLEMS DEVELOPED. ON MY TRIP TO FLORIDA LAST MONTH, I HAD TO REPLACE 3 OF 6 TIRES DUE TO THE TREAD DELAMINATING COMPLETELY FROM THE TIRE AS IF THEY WERE RETREADS. THIS HAPPENED ON THE INTERSTATE TRAVELING AT 65 MPH. THE TIRES NVER LOST AIR PRESSURE, JUST THE COMPLETE TREAD. I ENDED UP REPLACING ALL 6 TIRES ON THE TRIP TO FOR OUR OWN SAFETY AND TO PREVENT FURTHER DAMAGE TO THE COACH. THE MOTORHOME IS STORED INSIDE MY GARAGE WHEN NOT IN USE AND A TIRE PRESSURE MONITORING SYSTEM HAS ALWAYS BEEN IN USE. THE DOT CODE IS B3JH 009X 3112 MAKING THEM JUST 4 1/2 YEARS OLD. I HAVE CONTACTED MICHELIN ABOUT THEM, BUT DON'T APPEAR TO BE VERY...