Which vehicle is used specifically for moving equipment that cannot propel itself?

The vehicle specifically designed for moving equipment that cannot propel itself is a tractor. Tractors are fundamental in various industries, including aviation, for their ability to tow or push heavy equipment, vehicles, and trailers that lack their own means of propulsion. In airport operations, tractors are often engaged to transport non-moving ground support equipment, including baggage carts and other essential machinery, between different locations on the airfield.

Baggage cart tractors are a specific type of tractor often used for transporting baggage trolleys, but they represent a subset of the broader category of tractors and are not the only vehicles used for this purpose. The ground power unit and air start unit, while crucial in aviation, serve specific functions related to providing electrical power and starting aircraft engines, respectively, rather than moving immobile equipment. Thus, the general term 'tractor' is the most accurate answer in this context, as it encompasses the capability to tow a range of equipment that cannot move on its own.