[RMcNeal]

Sorry, I haven't had enough coffee yet.
If you are on a 30 amp shore power, then you only have 1 leg of 120 VAC coming in. The dog bone adapter splits this into the two legs that the 50 amp service expects, so that would be my first check. If you have power through the adapter on both legs, then check your cord. From there, check incoming power to the breaker panel inside the coach. I'll bet that one leg is dropped somewhere along that path.