2018 Kia Sedona Wheels Problems

AT 18,870 MILES THE LEFT FRONT TIRE OF MY 2018 KIA SEDONA SX LIMITED (ORIGINAL TO VAN KUMHO CRUGEN 235/55/R19) BEGAN TO PULL TO THE LEFT DURING HIGHWAY DRIVING. WENT TO LOCAL FIRESTONE DEALER. THEY PLACED THE TIRE ON THE RIGHT SIDE AND PULLED TO RIGHT. THEY SUGGESTED I TAKE IT TO THE KIA DEALER TO HAVE CAM BOLTS ADJUSTED. WENT TO KIA DEALER WHERE I PURCHASED THE VAN. THEY WERE NO HELP REFUSED TO DO ANYTHING THEY SAID NOTHING WRONG WITH THE TIRE. WENT BACK TO FIRESTONE AND PURCHASED A NEW KUMHO CRUGEN 235/55/R19 TIRE AND HAD IT PUT ON.UPON EXAMINING THE TIRE THEY SAID THE STEEL BELTS HAD SHIFTED. CONTACTED KIA DEALER WITH NO RESPONSE. CONTACTED KIA CORPORATE AND RECEIVED A REFUND FOR COST OF NEW TIRE. AT 39,444 MILES AGAIN THE LEFT FRONT TIRE (ORIGINAL TO VAN KUMHO CRUGEN 235/55/R19) BEGAN TO PULL SEVERELY TO THE LEFT DURING HIGHWAY DRIVING. WENT TO LOCAL FIRESTONE DEALER. THE STEEL BELTS HAD SHIFTED SEVERELY MISHAPING THE TIRE. AT THIS POINT I PURCHASED 4 NEW TIRES OF A DIFFERENT BRAND.

2 OF THE 4 KUMHO CRUGEN PREMIUM 235/60R18 TIRES ON OUR KIA SEDONA HAVE HAD TREAD SEPARATION. 21,000 MILES ON THE CAR SO FAR. CAR WAS IN MOTION AND EXPERIENCED RATTLING AND SHAKING EACH TIME.