What kind of car is difficult to move?

Windmill.

The car that is difficult to move is: a windmill. Windmills are not a means of transportation. They cannot walk and are difficult to move, so the correct answer is windmills. A windmill is a power machine that does not require fuel and uses wind as energy. Early wind turbines were also called windmills. Modern wind turbines mostly refer to wind turbines used for power generation, and are also used to lift water for irrigation.