2012 GMC SIERRA 2500 Wheels Problems

I PURCHASED A NEW GMC SIERRA HD2500 SLE IN JUNE, IT CAME WITH 20" ALLOY WHEELS AND GOODYEAR WRANGLER SRA TIRES (LT265-60R20), LOAD RANGE E. WITHIN 3 DAYS, I HAD A SIDEWALL PUNCTURE ON ONE TIRE WHILE DRIVING ON OUR RANCH. THE TIRE HAD TO BE REPLACED. NOW, JUST YESTERDAY, SEP. 15, I HAD ANOTHER SIDEWALL PUNCTURE WHILE DRIVING ON THE RANCH. I JUST LEFT THE LOCAL DISCOUNT TIRE, WHERE THEY ARE WAITING FOR A NEW TIRE TO ARRIVE SO THEY CAN REPLACE THE OLD TIRE. I'VE BEEN LIVING ON THIS RANCH FOR 47 YEARS NOW, AND HAVE OWNED AT LEAST 10 TRUCKS AND 2 SUBURBANS OVER THE YEARS. THERE IS A 3.5 MILE LOOP ROAD THAT RUNS AROUND THE RANCH, AND I DRIVE IT REGULARLY. THESE TWO FLATS ARE THE ONLY TWO I'VE EVER EXPERIENCED IN DRIVING THIS LOOP ROAD, WHICH IS A COMBINATION OF CALICHE AND LIMESTONE. THE...