Studebaker built these neat little vans for the U.S. Postal service. Zip Vans were right hand drive and featured a sliding door for the driver. The body was manufactured by Met-Pro of Landsdale, Pennsylvania. Zip Vans used the 112 horsepower overhead valve “Skybolt” six that was an adaptation of the old Champion flathead engine. The Zip Van remained in production after other Studebaker civilian truck production ended in order to complete the government contract.
via: Bill Jackameit’s Studebaker Page