Mason Truck, founded by A.C. Mason in cooperation with William C. Durant

William C. Durant

William Crapo "Billy" Durant was a leading pioneer of the United States automobile industry, the founder of General Motors and Chevrolet who created the system of multi-brand holding companies with different lines of cars....

, was a U.S.

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 truck manufacturer based in Flint, Michigan

Flint, Michigan

Flint is a city in the U.S. state of Michigan and is located along the Flint River, northwest of Detroit. The U.S. Census Bureau reports the 2010 population to be placed at 102,434, making Flint the seventh largest city in Michigan. It is the county seat of Genesee County which lies in the...

. As a subsidiary of Durant Motors

Durant Motors

Durant Motors Inc. was established in 1921 by former General Motors CEO William "Billy" Durant following his termination by the GM board of directors and the New York bankers that financed GM.-Corporate relationships:...

, Mason Truck built Road King Speed Trucks in the early 1920s.

Mason Motors was a separate venture, a Flint-based automobile engine manufacturer started in 1911, also by A.C. Mason, who first led Buick

Buick

Buick is a premium brand of General Motors . Buick models are sold in the United States, Canada, Mexico, China, Taiwan, and Israel, with China being its largest market. Buick holds the distinction as the oldest active American make...

's engine works in Flint. That company was absorbed by Chevrolet

Chevrolet

Chevrolet , also known as Chevy , is a brand of vehicle produced by General Motors Company . Founded by Louis Chevrolet and ousted GM founder William C. Durant on November 3, 1911, General Motors acquired Chevrolet in 1918...

in 1915, but remained under the Chevrolet umbrella until January 1, 1918, when it became known as the Motor & Axle Division of Chevrolet.