We have just completed our design of our BAT24. It uses a pair of wheel chair motors and a 4″ wide custom track and wheel system. So far we tested by driving Big Mike (290lbs) around including up a set of stairs. It is very impressive with abundance of power and torque. We will be offering this platform for our customers as a special order who want sorting bigger than our popular HD2 Tracked robot, but not as gargantuan as Project OverKill…