3 axles U type Tipper/Dump Semi Trailer With HYVA system :Widely used to transport sand, stone, coal and other solid building materials or industrial raw materials. Rear dump semi-trailers are designed to make unloading easier. After the back of the trailer is locked, sand can be loaded. When it arrives at the destination, the front side of the semi-trailer can be raised, which makes the goods drop from the back. The bucket of the trailer requires a thicker steel plate, because the goods are often hard materials, and the steel plate can prevent the cargo from damaging the trailer.