A four-axle dump semi trailer built by Tongya Automobile Co., Ltd for bulk haulage of sand, gravel, ore and coal. 50 t payload in a 37 m³ tipping body, ZY axles rated 13 t each, Jost king pin and a front-mounted multi-stage hydraulic lift — engineered for quarries, aggregates yards, mines and construction supply chains that need a high payload-to-tare ratio on long hauls.