Lowboys are a type of coverless semi-trailer. They are used for safe transportation of heavy machinery such as construction machines, tanks, boats, wind turbines and wheeled cranes. These machines are frequently used in freight transportation due to their ease of use, fast maneuverability, load capacity and height limit. Lowboys can easily pass through narrow spaces that are difficult to pass

Various types are available depending on the weight and volume of the load. These are generally dictated by the number of axles on which the weight is loaded. Lowboys are available in different types ranging from 2 to 6 axles.