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Oshkosh Corporation is one of the largest heavy truck manufacturers in the United States and owns many subsidiaries. The largest and most well known being Oshkosh Defense, which builds vehicles for the Military according to very specific Department of Defense requirements and requests. Oshkosh Defense developed its own patented suspension system known as TAK-4 which enables Maximum Traction, Power and Comfort even over the harshest road surfaces and off road driving situations. Oshkosh Corporation also owns Pierce Manufacturing which builds Fire Engines in for the North American market. Most U.S. Fire Engines also use military grade TAK-4 suspension systems which enable Fire Trucks to drive over potholes with no issues.

Oshkosh has won more bids for the Department of Defense than most of its competitors and many of its vehicles find work even when they are sold in to the civilian private sector. The TAK-4 suspension has proven useful for trucks performing logging work and other heavy duty off road work. Oshkosh entered into the Homeland Security segment with the Oshkosh TPV, a vehicle marketed toward Federal and Local law enforcement agencies as a SWAT truck with advanced capabilities.