I've had it with cheap Chinese trailer tires!

I don't like Carlisle tires. Father in Law had them on his toy hauler and had blow outs ever time he used it. Looked it up and Carlisle have the most complaints of any tires.
They were recommended to me by several guys at the track. The thing that has me concerned now is the Discount Tire unlimited warranty I paid $16 per tire for. What they told me at the store and what it says on paper are 2 different things. They say they have it in their computer and as long as the tire has 1/16" tread or more on it they will replace it for free for 10 years. I asked them if I could have something in writing that says that and the slick salesman I was referred to spent 5 minutes over the phone basically telling me "no".