NHTSA Complaint #10819296 — 2015 GMC SIERRA 2500

I BOUGHT A NEW 2015 GMC DOUBLE CAB 2500 HD Z71 4X4 PICK UP TRUCK IN MAY 2015 IT HAS FACTORY EQUIPPED LT 265X70X17 BRIDGESTONE DURAVIS 7 PLY TIRES. I TOOK IT ON A UNLOADED 9000 MILE ROAD TRIP AFTER ABOUT 7000 MILES I NOTICED THE TRUCK WAS NOT HANDLING LIKE IT SHOULD IT WANTED TO GO STRAIGHT THRU CURVES IT WONDERED AND PULLED LEFT OR RIGHT. I TOOK IT TO THE GMC DEALER IN SPOKANE WASHINGTON THE FOUND THAT THE ALIGNMENT TOW-IN AND RIGHT SIDE CASTER WAS OFF. THIS IS NOT MY FIRST GM TRUCK THE LAST ONE I DROVE 93000 MILES AND NEVER NEEDED AN ALIGNMENT. WHILE DRIVING TO BEND OREGON THE PROBLEM REOCCURRED. I TOOK IT TO THE CHEVROLET GM DEALER IN BEND ALIGNMENT CHECK WAS OK THEY SAID IT MAY BE TIRE PRESSURE RELATED I AM USING THE RECOMMENDED COLD TIRE PRESSURE OF 65 PSI FRONT AND 70 PSI REAR UNLOADED NOT PULLING ANYTHING. UPON RETURNING TO PRESCOTT ARIZONA I TOOK IT TO TIMS GMC DEALER AND THE ALIGNMENT WAS OK. I EMAILED BRIDGSTONE THEY REFERRED ME TO THE PHOENIX BRIDGESTONE DEALER THEY SAID THE TIRES FOR THAT TRUCK SHOULD BE LT 245X75X17 FIRESTONE NOT BRIDGESTONE. THEY SAID THEY WOULD CHANGE THEM OUT BUT NEED AN OK FROM THE GMC DEALER. THE PRESCOTT TIMS GMC DEALER REFUSED TO ACCOMMODATE THE REQUEST. CHECKING WITH SEVERAL TIRE DEALERS IN PRESCOTT THE TIRE REQUIREMENTS FOR A 2500 TRUCK ARE A FULL 10 PLY TIRE NOT THE 7 PLY FACTORY INSTALLED TIRE. NOTE: THE BRIDGESTONE TIRE HAS A 2 PLY SIDEWALL..... A MICHELIN 10 PLY TIRE HAS A 3 PLY SIDEWALL THIS MAY BE PART OF THE PROBLEM. THE RIM WIDTH IS.....7.5............LOAD INDEX..121/118.......SPEED RATING........Q.... COLD PRESSURE OF 80 PSI