Manufacturers will jump thru many hoops to avoid a warranty claim... I have had quite a few tires warrantied out, but never by a manufacturer.
Discount Tire has the best warranty and service in the business. I have bought almost all of my TT and other tires from them. They install LT tires on my TT, and wholeheartily recomend them, and warranty them.
JJ likes to talk a lot about the legalities as that scares some people... But really, according to him I should still be running ST tires as there are no other options...
In spite of the fact that I spent MANY thousands of dollars continuously upgrading the size and load rating of ST tires as I bought into all of the claims that are made for them.
I am sometimes a slow learner, but I DO learn.