[CORattler]

I believe that personal experience related here by many speaks volumes as to reliability and longevity. In the end, it comes down to what you are comfortable with... Myself, I decided to heed the advice and experience related by real people in the real RVing environment. I pulled brand new Marathons off my Monty and put on tires that were recommended as tried and true by people that have gone through the blowouts and tire failures. They weren't in the tire selling business so I had no reason to doubt their veracity.
Lonnie IS in the tire business and I value his input. I used that to guide my purchase. Personally, I believe I made a good decision. What you do, is of course, your decision. Good luck!