When an engine is operated, a power dividing mechanism divides power of the engine to output the power to a motor for running operation and a motor for a cargo handling operation, respectively. Each of loads is driven via a rotational shaft of a corresponding one of the motors. By operating the engine and supplying the motors with electric power from a battery to operate the motors, each of the loads can also be driven by the sum of power of the engine and power of a corresponding one of the motors. When surplus power is generated in the power of the engine, each of the motors is operated as an electric power generating unit by the surplus power. As a result, the battery is charged.