A safety system includes a vehicle having a cab and a compartment rearward of the cab, an engine that provides motive power to the vehicle, a generator positioned in the vehicle so as to supply electrical energy to the compartment, an alarm positioned in or on the vehicle so as to be cooperative with the engine and the generator, an alarm acknowledge switch positioned in or on the vehicle, a shore power connection on the vehicle, and a control module positioned in or on the vehicle so as to selectively activate or deactivate the alarm or to deactivate the generator when certain conditions occur. The generator has an on/off switch so as to turn the generator either on or off. The alarm is activated when the generator is turned on and the engine is not running. The alarm acknowledge switch is activatable as to turn the alarm off. The shore power connection is adapted to be connected to a source of electrical energy exterior of the vehicle.

To arrange a power unit, an electric power conversion unit, and engine-related components compactly, a drive motor, a reduction drive, a generator, and an engine body are integrally arranged in this order in a vehicle width direction of a power unit compartment such that respective heights thereof are substantially the same. An electric power conversion unit, in which a motor inverter, an electric power generation inverter, and a DC/DC converter are integrated, is arranged above the drive motor, the reduction drive, and the generator. Engine-related components such as a low-voltage battery, an air cleaner, and an oil filter are arranged above the engine body.