The square rear-end makes it a 21 footer, first made in California in 1951 and later in Ohio in 1953. Standard taillights were the early Bargman Trail-Lite rectangular taillights used from 1952 to 1953, replacing the single center taillight of older trailers.
Layout on this one has a pullout double and a dinette that made into a bed - and is unique with its streetside Jalousie Window.