Jerry,

Only the Watchdog products checks the coaches neutral. All of them check the incoming neutral. I've never been a fan of the TRC products because of where I live and their limited warranty.


David, the Watchdog is a complete replacement for the other products.

Your coach's reverse polarity light is just an indicator light and offers no protection. FWIW, unless someone just worked on a 50A pedestal the likelihood of reverse polarity is just about zero. A 30A outlet would be much more likely to have reverse polarity.