A truck (United States, Canada, Australia, New Zealand, Puerto Rico, also called a lorry in the United Kingdom, Ireland, South Africa, and Indian Subcontinent) is a motor vehicle designed to transport cargo. Trucks vary greatly in size, power, and configuration, with the smallest being mechanically similar to an automobile. Commercial trucks can be very large and powerful, and may be configured to mount specialized equipment, such as in the case of fire trucks and concrete mixers and suction excavators.