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Almost all RV appliances and accessories are 110, so one leg is hot and one leg is neutral. The trouble occurs when the neutral is substituted with the other hot leg in a 220 source. That scenario supplies 220 instead of 110 and is usually a death sentence to any device if it is on at the time.
The electric code determines which prongs in the outlet are hot1 hot2(if applicable) ground and neutral. A welder probably doesnt need a neutral. It would have had hot1 hot2 and ground. You can't "adaptor" your way out of this problem.
If I understand what I have learned a "Hot Dog" is a plug/adapter that is used when you need hot1 and hot2, but hot2 is unavailable on a 30 amp 110 standard RV outlet. The Dog Bone bridges hot1 to both of the hot outlet prongs so you wind up with hot1 hot1 neutral and ground. This allows all devices to have power but no 220 devices will work such as a clothes dryer. Also since you are hooked up to a 30 amp breaker you cannot run everything at the same time.
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