2008 Toyota 4runner Wheels Problems

BRIDGESTONE DUELER HT 684 11 TIRE SIDEWALL SEPARATED AT LOW SPEED, ONLY 1 PERSON IN THE VEHICLE. SIDEWALLS COMPLETELY SEPARATED FROM RIM TO TREAD ON SAME SIDE DIRECTLY ACROSS FROM EACH OTHER. SPEED WAS ABOUT 30 AT THE TIME ON A CITY STREET. ALSO TIRE HAD 23000 MILES AND DATE CODE OF 1114.

I TOOK MY VEHICLE IN TO THE DEALER FOR IT'S 30,000 MILE SCHEDULED MAINTENANCE EVEN THOUGH IT WAS A COUPLE OF THOUSAND MILES SHY OF THE REQUIRED SERVICE. THEY ROTATED THE TIRES ALONG WITH THE OTHER SCHEDULED SERVICES. SHORTLY AFTERWARDS (LESS THAN 2 WEEKS) I NOTICED THAT IT SHIMMIED ON THE HIGHWAY, SOMETHING IT HAD NEVER DONE PREVIOUSLY. I TOOK THE VEHICLE BACK TO THE DEALER, DUNNING TOYOTA OF ANN ARBOR, WHERE THEY PERFORMED ANOTHER $50.00 WORTH OF WORK AND I WAS TOLD THAT IT SHOULD BE BETTER NOW, BUT MY TIRES WERE CUPPED SO IT WOULDN'T RUN TOTALLY SMOOTH AGAIN UNLESS I PURCHASED NEW TIRES. I WAS TOLD THAT THE TIRE CUPPING WAS MOST LIKELY THE RESULT OF IT BEING OFF BALANCE FOR A WHILE WHICH MAKES NO SENSE TO ME SINCE THE DEALER WAS THE ONLY ONE THAT HAD EVER TOUCHED IT. THESE TIRES ARE SUPPOSED TO HAVE A LIFE OF 50K MILES. BE IT POOR SERVICE OR POOR TIRES, I'M TRULY DISAPPOINTED. I WAS ALWAYS UNDER THE IMPRESSION THAT MICHELIN TIRES WERE HIGHLY RATED. NOW I'M NOT IMPRESSED BY EITHER THE BRAND NAME NOR DUNNING. *TR