Bridgestone Duravis and Michelin XPS rib are two commercial long-wearing (and retreadable) tire lines available in light truck sizes that might fit your tow.
They score a lot lower on traction, particularly wet traction, and are not good tires for use in snow. Those are the tradeoffs when you optimize for wear rather than ride or traction. That should be less of an issue for tires used on a trailer, can be an issue on an everyday driver.
I've chosen to put the XPS Ribs on my motorhome, which I do not drive in winter weather and try to avoid driving in very wet weather. On my E-350 van, which I use all the time and take north in the winter, I still use all-season tires (LTX MS/2). Usefulness of long-wear rib tires depends on where and how you use them.