The vehicle comprising an adjustable length chassis, rotary spider arm wheel assemblies, including rotary peripheral minor wheels, a central propulsion means including a power source, a motor, and a pump which through a hydraulic system of flow dividers, check and control valves "T" and conduits applies a controlled differential action through a hydraulic wheel transmission to the wheel assemblies driving spider arms and rotating the peripheral wheels as required to accomplish a desired maneuver. The vehicle is capable of ascending and descending stairs or negotiating uneven terrain, maneuvering and spinning in place.
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