Maxxis now has a 6 yr warranty on their trailer tires ! Noone else does ! Google and see for yourself. Been using them for 10 yrs now and replace every 5, and I've had 1 tread separation, no blowouts, and I paid $34 for the replacement tire under the warranty that was just under 5yrs old. Try that with a Carlisle or any other brand !
They can and will fail eventually as any tire can, but to stand behind a warranty for that long means they believe in their product. In fact the warranty used to be 5 yrs, and was upped to 6.
maxxis.com/trailer/trailer-warranty
And by the way most tire dealers will tell you anything to get you to purchase the tires they have on hand and make them the most profit. I had that happen when I asked Discount tire to order my Maxxis. The salesman I dealt with didn't know about the warranty on the Maxxis until I told him. He looked it up and said wow, I didn't realize that. It only took 1 day to get them in and installed. Well worth the wait in my opinion.