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gmc=it does violate the NEC since the outlet in question is a 50a 120/250 volt device. The / in the equation means it is REQUIRED to supply 120 AND 250 volt max., not just 120volt. At least in every jurisdiction I've ever worked in. I was an EE and licensed as an EE & master electrician in 17 states, Canada and Mexico.
The neutral could be overloaded in the above case IF it was fed from two separate 50 amp breakers on the same phase. 50 + 50 still equals 100. The probability of anyone in an rv drawing that much current is highly doubtful, but is possible. In this case you would not be using a dog bone (which are perfectly safe) but plugging into a mis wired outlet.
Would it "hurt" being miswired in this fashion? Probably not, and would allow for more current draw than a dog bone would, but still a NEC violation and should be rejected by any inspector worth their pay.
Bill
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