In most states it depends on how they are hitches. A plate (fifth wheel) hitch with a ball mount pulling a second trailer would probably be legal in most states up to a certain length. However, two ball mounts in a row like what seems to be pictured in original OP would most likely be illegal in most states.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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