Buckboard - A horse-drawn four wheel carriage with a springy, flat-bottomed frame that rests directly on the axletrees rather on a spring suspension. Because of the lack of wagon springs, the benches are usually mounted on springs attached to the carriage frame. Also called a Jolt Buggy or a Jolt Wagon.
Buckboard and horses owned by William Hunter. Antelope, Montana. Photo by Russell Lee, November 1937. Courtesy Library of Congress, Prints & Photographs Division, FSA-OWI Collection, LC-USF342-T-030915-A DLC