Low flatbed semi-trailers are commonly used to transport heavy vehicles (such as tractors, buses, specialized vehicles, etc.), rail vehicles, mining machinery, forestry machinery, engineering machinery (such as excavators, bulldozers, loaders, pavers, cranes, etc.), and other heavy-duty goods. The lower the center of gravity, the better the stability and safety, and the stronger the ability to transport ultra-high goods and pass overhead obstacles. When loading mechanical equipment onto a low flatbed semi-trailer, it is usually done from the rear end of the semi-trailer by moving the mechanical equipment from the rear wheel frame or removing the wheels, and then fixing the mechanical equipment onto the semi-trailer.