Ford has built a medium duty truck since 1948, and it was redesigned for its second generation in 1953 becoming the F-500 and F-600. 1953 was the last year for the long-running Flathead V-8 replaced in 1954 with the 239-cubic-inch Y-block V-8. This 1956 F-600 was found languishing in a backyard in Hosmer, S. D. (Photo by Jim Meachen)