QUEST VEHICLE is a professional semi-trailer manufacturer, which delivers a large number of trailers every day. The semi-trailer we export is made of Q345B / Q460C steel, which has good toughness and strength. Most importantly, the weight of the same type of semi-trailer exported to Africa is 2 tons heavier than the trailer used in China. Thicker steel is used for bearing steel structure, suspension, leaf spring, and axle with larger tonnage. We will test the loading capacity of 150% before delivery. The semi-trailer can be used in Africa for more than 15 years.