I've had really good performance from the Nitto Terra Grappler G2's I had installed last January.
My dually came factory with General's, which wore out on the front tires at 18,000 miles.
Over 14,000 miles now on the Terra Grappler's and almost all of it hauling my truck camper around. And no wear yet evident, still looking like new. Mind you, I've never been convinced these could make the 50,000 mile warranty for the LT metric size I have (235/80R17's) but gosh they are sure giving me the indication that perhaps these can do it.