Goodyear Endurance. Made in the USA.
I've sold a lot of the Chinese Gladiator tires, with good service. The key is to look for an added steel plied sidewall, in my opinion. The extra steel in the sidewall adds the rigidity needed to handle heavy loads, plus the added air capacity. If you're hauling 12-14k regularly, the Goodyear G614 GST, as much as I hate Goodyear, has the extra steel in the sidewall and casing. The price is around $300 a tire, though, hence the reason I sell the Gladiator Q35s 10 to 1 vs the Goodyear. You can buy almost 3 to each of the Goodyear. Both tires have added silicone to the rubber compound for added wear longetivity. I have not had good service from Carlisle tires when loaded that heavy regularly.
I greatly prefer the Michelin LT245/75R16E XPS Rib steel cord sidewall tire for the utility trailer I use. The diameter is critical, otherwise the same model in LT235/85R16E would work. They both have the same load and speed rating. Both are commercial tires, designed to be regrooved and then retreaded. But now I am being forced to change to an ST rated tire, so it looks like the Goodyear G614 will be the next set. Because the Goodyear is a load range G, I also have to buy new 110 psi rated wheels. On top of all that, I absolutely despise Goodyear tires. Since 1971, my experience with them has ranged from exploding to disappointing. The best I can say for Goodyear is they arent as bad as Firestone or Kumho.
I don't know what you have for axles, but you might consider these. They are cheaper per pair (tire & wheel) than the G-614's will be for just the tire.
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Nick
I ended up going with the Goodyear Endurance. We'll see. First loaded trip will be this Sat.