Found a searchable photo site from Yale University that displays Depression-era photos. I was looking at my county (Hampden, MA) and a couple of photos showed travel trailers being
sold at The Big E in West Springfield, MA, a fair well known to anyone in the New England area. Site is photogrammar.yale.edu. (I don't know how to do a link) You can search "trailers" and find them.
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Fiberglass RV