Can't tell a model from the pic. There's a couple of common design elements. Blowing up the photo a bit seems to show the trailer is a precursor to the modern fifth wheel. I've seen several examples of this type where a ball was mounted in the trunk.
With the trailer wheels so far back an A frame hitch would have put too much weight on the common bumper hitch of the time necessitating a dolly.
AirForums # 2806
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Avid supporter of trailing edge technology.