I have an old F-350 and before I bought the highest rated tires I could find- Bridgestone Duellers I had a couple of blow outs and one where the bands failed in it. I'm only towing 13,400 max. with 2300 pin weight. Seems like the tires on the fifth wheel and the truck are the first things to fail if you don't really upgrade to the good ones. You can change your pin weight a little by raising the hitch to put more weight on the trailer wheels but you don't want to lose too much pin weight either. I have seen times when I was glad that I had the F-350 crew cab long bed.