I had my other TT for 10 years. It came with Marathons and I installed two more sets, due to age and mileage. Ive never ha a blow out. I check the tires air pressure before the trip and during the trip. My new to us much heavier TT came with Load star tires. Typically I see these on tractor Trailer rigs. They were fine but more than 8 years old, so I replaced them with Good Year Endurance tires last year. yes they are ST's not LT's but a took a 500 mile round trip last year and they ran quiet and cool. We just got back from 1500 miles same thing. I don know how your loaded, or how you tow. But if you go fast and drive as if not towing that can stress the tires. Your axles could be ut of alignment do you have uneven wear? Just my opinion, but I would change out the fronts to be Marathon as well. Same set all around.