My Titan tires which came with my 17.5' Trophy have given me problems for each of the past three years. First, I hit a Detroit pothole & grew an instant breast. (not me, but the tire The next year a new titan got dry-rot cracks down in the tread valleys. It would no longer hold air. Finally, this year I took another pothole & blew the smitherines out of my Titan. I stuck with this brand thinking they were best suited for my rig. These are ST rated; but, my neighborhood used tire salesman told me to buy an E rated tire with more plies. I've heard good things about GoodYear Marathons & www.tractorsupply.com. He also told me to release some of that tire pressure when storing my boat for a long time. Any feedback is helpful.