2002 GMC SONOMA Unknown Or Other Problems

During an oil change I noticed unusual wear on the front passenger side tire. Upon investigation my mechanic found that the chassis was cracked which pushed the tire causing it to rub. Very concerned this could have caused a very bad accident.

MY SPARE TIRE ON MY 2002 GMC SONOMA PICKUP FELL OUT OF ITS CARRIER. IT ROLLED ACROSS TWO LANES OF TRAFFIC, LUCKILY TRAFFIC WAS LIGHT AND NO ONE WAS STRUCK BY THE RUN AWAY WHEEL. I APPEARS THE CABLE THAT SECURES THE SPARE ON THE TRUCK PARTED. THIS IS THE FIRST TIME THE SPARE HAS BEEN OFF THE TRUCK. *JB

THE SPARE TIRE FELL OFF WHILE DRIVING. THE WIRE CABLE SNAPPED. *JB

CONSUMER REQUESTED INFORMATION FOR SERVICE BULLETINS OR RECALLS ON THIS VEHICLE. *TS *JB

I NOTICED IN A REFLECTION OFF THE VEHICLE IN FRONT OF ME THAT WHEN I TURNED MY TURN SIGNAL (DOESN'T MATTER WHICH ONE, RIGHT OR LEFT), THAT MY DAY TIME RUNNING LIGHTS GO OFF. THIS STARTED OUT AS ONLY HAPPENING ON OCCASION AND THEN PROCEED TO GET WORSE. BY FEBRUARY 17, 2003, THE DAY TIME RUNNING LIGHTS WOULD GO OFF EVERY TIME I USED MY TURN SIGNAL. I TOOK MY VEHICLE INTO THE DEALER ON THAT DATE AND WAS INFORMED AFTER THEY HAD CONTACTED GM, THAT IT WAS NORMAL FOR IT TO DO THAT. I BOUGHT THE TRUCK IN JULY OF 2002 AND IT HAD NOT DONE IT UP UNTIL THAT POINT, I KNOW BECAUSE I HAVE FOLLOWED MY HUSBAND'S VEHICLE SEVERAL TIMES AND HE WOULD HAVE NOTICED IT. ANYWAY, THE DEALER SHOWED ME IN THE OWNERS MANUAL WHERE IT SAYS SOME VEHICLES MAY DO THIS AND THEY REFUSED TO...