... shell, reinforced chassis, high load-bearing capacityØ Frame use 320 mm 8 +7 double reinforced beams, the cross member is thicken ... reinforced spring, the rear axle leaf spring increase from 20 mm to 22 mm, balance suspension spring increase 1, spring into the slide ... its experts. compared with traditional heavy truck, the capacity increase 20%, the brake efficiency increase 5%. It is more stable ,lower ...