1.3 axle U shape dump semi trailer is used to transport of bulk cargo, coal, ore and build materials. The corner of U-shaped box doesn't exist dead ends, unloading more clean; 2. Hstar 3 axle 30 cubic meter dump trailers structure of the lower center of gravity to avoid the goods spilled; 3. Double-plate main beam of heavy-duty U shape dump semi trailer with stronger load-bearing capacity.