A 3 axles lowboy semi trailer is a semi-trailer with a low height from the ground. It is capable of transporting various construction machinery and mining machinery. Due to its low platform, it can transport some ultra-high and long large goods. In addition, it can also transport construction machinery such as excavators and bulldozers.

The main structure of a low-bed semi-trailer includes suspension system, axle, frame, hydraulic ladder, tires, traction device and braking system, etc. Compared with flatbed semi-trailers, low-bed semitrailers are also equipped with a gooseneck device.