Cargo truck is a type of motor vehicle designed specifically for transporting goods and materials over long distances. These cargo trucks are typically equipped with a large, enclosed storage area known as a cargo bed or container, which allows for the safe and secure transport of various types of freight. 

Size: Cargo trucks come in various sizes, ranging from small to medium to large. Small cargo trucks, also known as light trucks, are typically used for local deliveries and can carry a small to moderate amount of cargo. Medium-sized cargo trucks are commonly used for regional transportation and have a higher capacity than light trucks.

2. Purpose: Cargo trucks can also be categorized based on their intended use. For example, some cargo trucks are designed for general freight transportation, while others are specifically built for refrigerated or temperature-controlled cargo.

3. Capacity: Cargo trucks can vary in terms of their payload capacity, which refers to the maximum weight of cargo that they can carry. Light trucks typically have a payload capacity of up to 3 tons, while medium trucks can carry between 3 to 7 tons.