3 axle low bed semi trailer is commonly used to transport heavy-duty vehicles (such as tractors, buses, special vehicles etc.), rail vehicles, mining machinery, forestry machinery, and construction machinery (such as excavators, bulldozers, loaders, cranes etc.). ) and other heavy-duty cargoes, the lower the center of gravity, the better the stability and safety, the stronger the ability to transport ultra-high cargo and obstacles through the head.Extendable lowboy trailer is for shipping heavy and long cargo.