Like the title says wondering what would work best on my 06 dually. I have a 2.5 leveling kit up front and had solid block made for the rear and will probably run a spring helper or something of the sort to keep the rear from sagging and of course I have a nice set of wheel spacers for the rear. Now my question is I also have gooseneck trailers I will be towing with this am I better off running the 305's or can I get away with the 315's? I did a search for some pics but all I could find where lifted duallys or running 10 lugs neither of which answers my question. Preciate the help.