I keep LT265/70-17 C load range tires on the wifes 1500 crew cab 4x4 pickup. I've used load E tires on a couple of std duty 1/2 ton trucks before but always dropped them and went back to a P or load C tire.
Most 1/2 ton wheels aren't load or pressure rated for 80 psi or 3042 lbs capacity anyway and was a waste of money for my use even at max axle loads.
Half ton trucks like the OP's truck have a 3800-4000 lb RAWR rating which includes the rear spring pack/tires and wheels. A 2200-2500 lb rated tire would give a nice reserve capacity.