These one-wheel trailers (seen some with two wheels also) do hinge at bumper. Main advantage versus a normal trailer is that motorhome can be backed up as if nothing was back there.
P.S. -- hinge point is not a standard receiver. The ones I've seen at Houston RV show had two points off frame rails that only pivot up and down, not side to side. Seem often marketed for golf carts and large motorcycles.
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