Tower Automotive, 221 S Progress Dr W, Kendallville, IN 46755, US

Hendrickson Suspension is a division of Hendrickson USA, a supplier of air suspensions, auxiliary lift-axle systems, steel leaf springs and bumpers for trucks, tractors and trailers in the heavy-duty transportation industry. The company's products support every major North American heavy-duty truck and trailer original-equipment manufacturer, as well as many manufacturers in Europe, Australia, Mexico, Japan and Latin America. Its capabilities include computer-aided engineering, prototype testing, CNC machining and synchronous-flow manufacturing. Hendrickson's line of spare parts includes torque rods, bushings, cushions, shocks, frame hangers, air controls, brake components and pivot connections. The company features pneumatic and electronic products, such as backup alarms, remote QUIK-DRAW activation, axle controls and height-control valves. It is a part of The Boler Company. Hendrickson Suspension has a facility in Kendallville, Ind.