This chapter offers a comprehensive overview of power supply vehicles, which are crucial for providing reliable electricity during emergencies or in remote locations. Firstly, it introduces definitions, applications, and development trends in mobile power solutions. Secondly, the chapter covers the classification and a variety of typical products, including standard vehicle-mounted, trailer-mounted, high-voltage, UPS, EPS, and military power supply vehicles, highlighting their unique features and functions. Detailed procedures for operating mobile power supply vehicles are provided, including preparation, starting, operation, shutdown, and maintenance of generator sets. Finally, common faults and troubleshooting methods are discussed for both generator sets and UPS power supplies, and the chapter concludes with principles for selecting appropriate power supply vehicles.