I have a simple test plug that I keep in the coach. My coach has a 115V receptacle in the power cord storage bay. I keep it plugged in there. As soon as I plug into a power source there are 3 lights on the test plug that light up in different configurations depending on the polarity and presence of a proper connection. These test plugs are available at any hardware store. It's primary function is to check proper wiring of a receptacle but I believe it would indicate an improper ground as well.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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