I'd also recommend airbags. They won't increase your towing capacity, but they improve your ride loaded and unloaded.
I know on the '06 Dodges the amount of leafs in the main pack and the amount of overload springs is the difference between a 2500 and 3500. The 2500 has one more leaf in the main pack than the 3500 and no overloads where as the 3500 has one less leaf in the main pack than the 2500 and two overloads. At least that's it is is with the springs that came on the truck and the springs that I bought through Dodge for a 3500 to put on my truck. The 3500's also have mounts welded on the frame from the factory for the overload springs to hit.
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