The company was founded in 1917 as the Wisconsin Duplex Auto Company and was created to build a severe-duty four-wheel-drive truck. The first prototype was built, and upon its strengths as a vehicle, the company began to take off. This first four-wheel-drive truck is known today as Old Betsy. It is still owned by Oshkosh Corporation and housed in one of its assembly plants in Oshkosh. Old Betsy still runs and is used frequently in demonstrations and parades.
The company took on the name Oshkosh Truck in 1918, when it moved to Oshkosh. It began building defense trucks during World War II. An Oshkosh truck is the current prime mover for the British Army Heavy Transporter, capable of carrying 118 tons.
* Heavy Expanded Mobility Tactical Truck - HEMTT and HEMTT-A3 (hybrid truck).
* Heavy Equipment Transporter
* Homeland Security command vehicle
* Bushmaster IMV Mine-Resistant Ambush-Protected (MRAP) vehicle, produced in partnership with the Thales Group
* Medium Tactical Vehicle Replacement (MTVR)
* Palletized Load System (PLS)
* Logistics Vehicle System (LVS)
* Sand Cat