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A google image search for "1943 M3A4" will yield some good pics of these neat trailers.
http://images.google.com/search?sourceid=navclient&ie=UTF-8&aq=&oq=&rlz=1T4GGLL_enUS378US382&q=1943+M3A4&biw=1366&bih=586&sei=PiH_UJPNCIXW0gGWqoEI&tbm=isch