We have 15" wheels with LR D tires on our trailer, and are also contemplating what to put on next. Theoretically, the LR E tires have enough capacity, but were thinking of going up to LR E Maaxis for a little piece of mind. Another option that looks pretty good to us is the Goodyear Cargo G26 which is a rib style tire made for the Euro-style vans like the Sprinter. It comes in 225/70R15C rated for 2470lb@65psi and is 27.4" dia. (vs. the ST225/75R15 LRD for 2540lbs@65psi, 28.3" dia), but is a heavier tire (33 vs. 30 lbs), and is rated at the higher LT speed ranges. Now if you need the 2830 lb @ 80psi Load Range E tire, the Cargo G26 might not be enough, but if you are under 10,000 lbs on the axles, they may be the way to go ....