My setup is similar. 3150 with me, Duster, back halfed ladder bar 727 Dana 4.56 but I only have a 1.45-1.47 60ft. I've ran M/T 29.5x13.5 for years but tried Hoosiers 31x14 on my last set of tires as I wanted to go to a taller tire. I've always ran tubes just seems my car works better with them and it allows the sidewalls to last longer. I need a new set and will be switching back to M/T just a personal preference. If I were you I'd go with the stiffer sidewall.