[Alan Anderson]

Everyone is assuming that a 6WD center-drop drivebase necessarily rocks and has only 4 wheels on the ground at a time. This is not always the case. With just the right amount of center wheel drop, all six wheels are in contact with the field carpet at all times and there is no noticeable rock. With the appropriate center of gravity, the robot spins around its center wheels.

Besides, some 6WD systems have no drop and still work well.