Here is a robot designed for all terrain action. The 4WD IG52 ATR has 13 inch tires, a Sabertooth dual 25A motor driver, a Skeptrum transmitter / receiver, and a 12v battery. It has a max payload capacity of 100lbs.
The kit comes with everything you need to get started. Superdroidrobots allow their customers to customize orders. More info is available here.