I am thinking the person you are talking you has no knowledge that is relevant to your Progressive Industries EMS-HW50C... The unit protects low voltage and high voltage excursions... Below 104 volts and above 132 volts. It will not let the voltage outside of its parameters into your coach if properly installed.
If you are going to have it installed I would recommend that it be installed prior to the transfer switch... That way you are protected from the generator as well as the campground hook ups...
You may well have other issues... When the common is compromised what you have is the potential for extremely high voltage on one leg and extremely low voltage on the other.
If your Fifth Wheel has 50amp service then one leg will have been extremely high and the other extremely low. Depending on what was on each leg resistive loads are more susceptible to high voltage and inductive loads more susceptible to low voltage... Motors are inductive and will draw more current as the voltage is reduced.. Heating elements are resistive and will draw more current as voltage is increased... Current will generate heat that can exceed the tolerance of the component effected.
My point is that anything and everything that has voltage to it that was connected and in operation is suspect needs to be checked and evaluated ...
I recommend that you have your Progressive Industries EMS-HW50C installed as I described.
JohnnyT
