I have a set of Fred's spacers for my dually for when I put on my 235 tires in a few months. I went with the 2" aluminum spacers...no mods to lug studs. Fred's spacers come with a machined lip that maintains hub-centric wheel fitment which will definitely keep the wheels from loosing up or shearing off the studs. I tow fairly light 9500lb 5ver.