The Prairie Schooner.

Via: The Vintagent

"M.E. Gale in June of 1915 rode a Schickel 'Big Six' chain-drive 6hp 2-speed model that was attached to a 'prairie schooner' covered wagon (with motorcycle wheels replacing the original wooden spoke items). Gale set off with his family in tow from Stamford CT to San Francisco, with an expected travel time of 100 days. His two sons rode a Lightweight model with a twin saddle (side by side!). Gale was a professional rider who made his living performing endurance stunts for advertising campaigns. Whether he made it or not is unknown"