This tank tread system worked very well for us in climbing the platform in 2004 - our arm tilted in the direction of the climb to give us CG advantage when climbing. When climbing down, we kept the arm in the same position and drove in the opposite direction. Very stable.
Game rules (bumper design requirements, ability of appendages to leave base footprint, etc.) may prevent the use of such a method in future "step" games. There are also nagging little weight, cost, and reliability of tread factors associated with this and similar treaded designs.