Low flatbed semi-trailers are typically used to transport heavy-duty vehicles (such as tractors, coaches, special-purpose vehicles, etc.), rail vehicles, mining machinery, forestry machinery, construction machinery (such as excavators, bulldozers, loaders, pavers, cranes, etc.) and other heavy-load goods. The lower their center of gravity, the better their stability and safety, and the stronger their ability to transport oversized goods and pass overhead obstacles.

The cage semi-trailer refers to a semi-trailer with a cage structure installed at the cargo part. It is generally mainly used for the transportation of agricultural and sideline products and other light and bulky goods, and is one of the commonly used transportation tools in consignment stations and express delivery companies. This model is characterized by its wide range of applicable goods and convenient loading and unloading. The cage semi-trailer adopts a grid-type load-bearing design. The main frame is usually made of high-strength steel to achieve lightweight. A detachable roof is set on the top of the cargo box. The typical model length is between 9.5 and 13 meters.