You've blown a GFI breaker. Look around at the electrical wall plugs and you should see some that have a test and reset push button. Push the test and reset on all of them. I'm not at all sure how many circuits the Newmar has. My Monoco has two different GFI circuits.
It's possible you may have an appliance that you can't use on a GFI circuit. The neutral and ground can not be connected or it will blow the breaker. All kitchen, bathroom, and outside circuits should be GFI protected.
good luck






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