... 2.5mm, side wall steel sheet 1.2mmRunning GearSuspensionTri-axle mechanical suspension with 11-pcs leaf springTires11.00R20, 12unitsAxlesCNHTC ... axle, load capacity 13T, 15TBrakesDual lines pneumatic brake system, WABCO ... pin plug socketPaintColor upon requestThe specs above are for reference. Tri-axle Gooseneck cargo semi-trailer