2006 ITASCA SUNCRUISER Tires Problems

WE PURCHASED FOUR (4) NEW MICHELIN TIRES FOR THE REAR OF OUR 2006 ITASCA SUN CRUISER IN JUNE, 2014. THESE ARE THE MICHELIN XRV TIRES (235/80R22.5). WHILE DRIVING ON I-24 IN MANCHESTER, TN, WE HAD A BLOW OUT ON ONE OF THE NEW TIRES (REAR, OUTSIDE TIRE BUT THE DAMAGE WAS ON THE INSIDE NEXT TO THE AXLE TIRE). LUCKILY, WE CARRY A SPARE TIRE ON A RIM. CONTACTING THREE DIFFERENT DEALERS IN THE AREA, TO GET NO HELP, WE DECIDED TO CONTINUE WITHOUT A SPARE TIRE TO OUR FLORIDA LOCATION. UPON ARRIVING IN FL, WE ARE NOT GETTING ANY SATISFACTION FROM THE LOCAL MICHELIN DEALER OR THE MICHELIN CORPORATE NUMBER. WE HAD LESS THAN 500 MILES ON THESE NEW TIRES. THEY WERE INFLATED CORRECTLY AND CHECKED DAILY. WE STILL HAVE THE OLD TIRE FOR INSPECTION. TO ADD INSULT TO INJURY, THESE TIRES NOW ARE ON A NATIONAL BACK ORDER...