When you really need to maximize your towing and hauling potential, you need to up the ante with a dually truck — that is, one with dual rear wheels. It's pretty much what it sounds like, as duallys ...
Running 47-inch tires is becoming more common (hey, we did it!). What isn't common is seeing them on a vehicle that is reliable and strong enough to be daily-driven and used for tow duty and off-road.