The toughest environment ever, could be flatbed and lowboy trailer decking. Lowboy decks really get a beating, dozer tracks doing what they do. Apitong is kind of the industry standard for re-decking trailers, sure is pretty wood, silvers beautifully in a couple years. I don't think it is terribly expensive, but you could go to a commercial trailer website and probably get a real world price. I have no idea how suitable it would be for residential service, but with no treatment whatsoever, weather checking is minimal, slivering seems minimal, warping non existent. Countersunk bolt heads collect water and mud and they do not rot or soften. I have been called many things however, carpenter ain't one of 'em.
