A trolley pole is supported on a vertical shaft so as to be rotatable from side to side while in its elevated, operating position. The shaft is supported on a support structure which is tiltably mounted on a base plate on a vehicle. The base plate can be tilted by extending the arm of a linear actuator. When the base plate is tilted, the pole is lowered and centered and a gravity operated latch structure comes into effect to maintain the pole centered whenever it is not in its operating position. A control circuit coupled to the actuator extends and retracts the actuator arm to pivot the support structure between an upright and a stowed position.