In late 1937, while recovering in an Indianapolis hospital from an appendectomy, Tucker was reading the news about war looming on the horizon in Europe. He got the idea of developing a high-speed armored combat vehicle. In 1939, Tucker moved his family back to Michigan and bought a house and property in Ypsilanti. He remodeled an old barn on his property and began and operated a machine shop called the Ypsilanti Machine and Tool Company, planning to use the facility to develop various automotive products.