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I can't find any information either but I have seen it before.
I believe it is a hitch for a single wheeled trailer. The design allows the trailer to sway back and forth, but the hitch design does not allow the trailer to tilt to one side like a ball hitch would.
You unscrew the top part, put the trailer hitch on, and screw the top part back on. That's the way it looks to me anyways...
I can't find any information either but I have seen it before.
I believe it is a hitch for a single wheeled trailer. The design allows the trailer to sway back and forth, but the hitch design does not allow the trailer to tilt to one side like a ball hitch would.
You unscrew the top part, put the trailer hitch on, and screw the top part back on. That's the way it looks to me anyways...