Don't know the answer the question but our shop runs a 1 ton dually d***e and I have worked there for way to long. We used to change tires just about every year on this truck till we stuck Michelines on it. This last time it has been 3 years. We just run the pressures listed on the door and it has a flatbed on it. Runs anywhere from empty to fully loaded with a goose neck (old and drags like a sled) with equipment or tractors on it. The Michelines not only lasted longer they rode better. They also are not the popular wide tread tire but are the load range E. They were pricey but more than paid for themselves in the end. Also we religiously rotate every 10k miles.