War wagon trailer. Government workers in Washington, D.C., step from the war wagon trailer sponsored by the Office of Defense Transporation. Built on a steel frame, the coach is made principally of wood and masonite. It is only twelve feet long and seven feet wide and has a seating capacity of twenty-four, as contrasted to the average city bus that seats forty passengers and is approximately thirty-two feet long and eight feet wide. Sourced from the Library of Congress.