Vintage C & M Industries L.P. GAS DETECTOR Model RV-12 Camper Canned Ham
Check out the pictures. This has been sitting on the shelf for a number of years.
RV Surge Protector 50Amp 20000J IP68 Waterproof Circuit Analyzer GutterWord
50AMP RV Circuit Analyzer RV Surge protector + circuit analyzer in one. Using a surge protectors before connecting the RV will verify that the power is wired correctly, and will also help detect most wiring fault problems.