With your big Ford and the Callen,I can't recommend enough the need for a tough, E-rated tire. Toyo makes a 315-75-16 MT. Insanely good flat resistance and a 3800#+ load capacity. It would take a 8.5-9.0" wide rim to accomodate these though. If you go to a 17" rim,it opens up the Toyo 285-75-17 AT or MT. I'm running the AT with great results. The last thing anyone needs is a flat or a blowout on a fullsize truck. I've experienced both w/Bridgestone AT's. The Toyos have been perfect.
