2001 FLEETWOOD EXPEDITION Tires Problems

I DRIVE A 2001 FLEETWOOD 36' EXPEDITION, IT HAD ABOUT 21,00 MILES AT THIS TIME. ON OCTOBER 20, 2003 I HAD A R/F STEERING TIRE BLOWOUT S/E OF ST. LOUIS MO. AROUND 5PM. HAD ROAD SERVICE PUT ON A USED TIRE. SPENT THE NIGHT IN SULLIVAN MO. AT A FLYING-J ABOUT 75 MILES DOWN THE ROAD. THE MORNING OF THE 21ST. I CHECKED ALL TIRES FOR CORRECT PRESSURE. NONE WERE FOUND TO BE LOW (100PSI). CONTINUED TRIP TO SPRINGFIELD, MO. WHERE AFTER ABOUT 130 MILES A L/R INSIDE DUAL BLEW.THESE ARE MICHELIN TIRES SIZE XRV 235-80R-22.5. THE FRONT TIRE WAS IN SHREDS AND I HAD NO WAY OF HAULING IT. I LIKE MICHELIN TIRES AND SO ORDER 6 NEW XZE TIRES. THEY WERE JUST PUT ON TODAY. SO AT THIS TIME THE DEALER HAS THE INSIDE TIRE WATING FOR THE MICHELIN REP. TO LOOK AT IT. THE DEALER SAYS IT...