2013 GMC SIERRA 1500 Wheels Problems

TWO OF THE FOUR WHEELS WERE LOSING AIR AND TESTED LOCALLY. IT WAS DETERMINED AIR WAS LEAKING FROM EACH OF THE TWO RIMS IN A SIMILAR LOCATION. NOTE-AIR WAS NOT LEAKING FROM THE TIRE OR THE SEAL BETWEEN THE TIRE BEAD AND RIM. INSTEAD, THE RIM ITSELF APPEARS TO HAVE A LATENT DEFECT CAUSING A SLOW LEAK. I CONTACTED A LOCAL GMC DEALER TO SEE ABOUT WARRANTY COVERAGE OR MANUFACTURE INTEREST IN ASSISTING WITH THIS SAFETY ISSUE. VEHICLE IS OUT OF WARRANTY AND GM WAS WILLING TO PARTICIPATE AT 10% OF NEW REPLACEMENT COST, SEE ATTACHED. TWO OF THE FOUR RIMS WERE TESTED FOR THE DEFECT. BOTH RIMS EXHIBIT THE SAME DEFECT. THAT 1/2 OF THE RIMS ON MY ONE TRUCK ARE LEAKING, IT SUGGESTS A LARGER DEFECT IN THE STANDARD RIMS. I AM CONCERNED ABOUT MOTORIST SAFETY RESULTING FROM DEFECTIVE RIMS.