The February 1963 issue of Popular Mechanics included an article about the New Mexico Jeep Derby held annually in Truth or Consquences, New Mexico. It’s a great article about the early days of jeep racing. I’ve also included a video of one Derby race, but the quality is poor. Still, in some clips, you can see just how much the co-pilot shifts his body around the jeep.

View Popular Mechanics February 1963 at Google Books