There are not a lot of choices when it comes to a good ST tire. Maxxis is probably the best. Any name brand LT tire is a good choice. Although you don't need a G rated tire, Saliun G rated tires are LT's designed for trailer use. They may not cost any more than a good LT tire. They are rated for 110 PSI so you would need to check your rims before purchase these tires. You could probably get by on running 100 PSI with your weight. Michelin makes a all steel belted LT tire, Ribs, but they are expensive. I have ran B F Goodrich Commercial LT tires with good results.