Who Invented the Semi?
Meet August Fruehauf
Mr. August Fruehauf is who invented the semi-trailer in 1914. Fruehauf went by “Gus,” was a member of the Knights Templar, and at least partially developed the idea for the semi-trailer as part of his solution to how to haul a friend’s boat.
Source: A great read by Ruth Fruehauf and Darlene Norman, “August ‘Gus’ Charles Fruehauf.”