Definitely consider powder coating the calipers. When we installed the new tires from 4Wheelonline, the new calipers were rusty so we cleaned them thoroughly and have them coated. Still clean when we rotated the tires.
My brother just got a set of AT3's onto his truck, with xd wheels and new rotors. His wife can't stand the noise of Ridge grappler on the road. Going to mention to him about the wet traction.