I'm away from references at the moment but will try to scan what I think you are talking about tonight. The piece of kit I'm thinking of came in two sizes, attached to the pintle of the towing vehicle, had one axle and an a-frame to lift the towed vehicle as well as a device to hold distance between the two. The name that comes to mind for the device is "dummy axle". If I recall comments correctly, it wasn't much loved by users.
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