I agree with others who said to hold off on air bags and Stableloads until you test drive the truck with your camper (good choice on the Wolf Creek 850, btw). As for a sway bar, the newer Fords (2011+ F250/F350s) all have a front sway bar only unless you get a truck with the camper package; Fords with the camper package get both a front and rear sway bar. Because of this I don't think you could go wrong buying a rear sway bar from the beginning, though in general, I discourage suspension mods before test driving your truck with your camper.