1986 GMC Suburban

I HAVE A FIRESTONE LT245 75R16 STEELTEX A/T THAT I USED ON MY SUBURBAN. I REMOVED IT TO INSTALL LARGER TIRES AND USED THE BEST TAKE-OFF FOR A SPARE KEPT INSIDE THE VEHICLE. I KEPT THAT SPARE TO USE ON MY TRUCK THAT I PURCHASED A FEW MONTHS AGO AND PUT THE SPARE IN THE BED OF THE TRUCK, KEPT INSIDE A GARAGE. WHILE THE TIRE DID NOT "BLOW" AND LOSE AIR, IT SEPARATED AND THREW OFF 1/3 OF THE CIRCUMFERENCE WORTH OF TREAD WHILE JUST SETTING THERE. I KEPT THE CARCUS TO HAND OVER IF YOUR INTERESTED. I DO HAVE A FEW DIGITAL PICTURES I COULD SEND YOU. THIS TIRE SHOULD ALSO BE OFF THE ROAD. *JB

I CONTACTED THE GMC SUPPORT CENTER ATTEMTPING TO FIND OUT IF THE RECALLS LISTED FOR THIS VEHICLE HAD BEEN COMPLETED.THEIR RESPONSE TO MY WIFE TODAY WAS RUDE AND INAPPROPRIATE. THEY STATED "THAT IS A 14 YEAR OLD VEHICLE, WE HAVE NO INFORMATION ON IT". THEY RECOMMENDED CONTACTING A LOCAL DEALER (WHICH I DID, TO NO AVAIL). ALL I WANT TO KNOW IS IF THE SAFETY RECALLS FOR THE LIGHT SWITCH, THE FUEL TANK SHIELD, AND THE LOWER CONTROL ARM CRACKING HAVE BEEN COMPLETED. I DO NOT BELIEVE THAT THE MANUFACTURERS RESPONSIBILITY TO CORRECT THESE PROBLEMS (IF THEY ARE APPLICABLE TO MY UNIT) ENDS JUST BECAUSE A CERTAIN TIME SPAN HAS ELAPSED. HOW CAN I DETERMINE IF THESE RECALL CAMPAIGNS HAVE BEEN PERFORMED ON MY VEHICLE, AND HOW DO I ENSURE THAT GMC WILL PERFORM THEM IF THEY HAVE NOT BEEN COMPLETED?