2016 HEARTLAND ELKRIDGE Wheels Problems

I HAVE HAD TWO OF THE ORIGINAL TOWMAX TIRE SIZE 225/75R15 TIRES BLOWOUT ON MY NEW FIFTH WHEEL. IN BOTH CASES I WAS GOING UNDER 65 MPH. A THIRD REPLACEMENT TOWMAX TIRE WAS PUT ON MY VEHICLE AND I DROVE HOME. THE NEXT DAY THAT TIRE WAS GOAT BECAUSE OF A CRACK IN THE SIDEWALL. IF I HAD DRIVEN ON IT FOR ANY DISTANCE, IT TOO WOULD HAVE BLOWN. HEARTLAND REPLACED ALL THREE TIRES, BUT I DON'T TRUST ANY OF THEM. UNFORTUNATELY THE BEST I CAN DO IS GET THE DEALERSHIP TO REPLACE THE TIRES WITH A DIFFERENT BRAND FOR A 50% DISCOUNT WHICH IS WHAT I AM DOING. ALL THREE PROBLEM TIRES WERE LESS THAN A YEAR OLD AND HAD ABOUT 2000 MILES ON 2 OF THEM AND LESS THAN 100 MILES ON THE THIRD ONE WITH THE CRACK. THESE TIRES ARE JUNK AND UNSAFE. MY RECOMMENDATION IS YOU...