My system is a little different, but I landed the wires from the surge protector on my contactor for the transfer switch, one on each pole. It is the same effect as landing the wires on the main 50 amp breaker, you just need a ground, and one each pole. I check for a ground with my meter. When I plug in on park power, the transfer switch has to have good voltage, or it won't pull in the 50 amp contactor.
Mine saved my system in my RV and also in my home, where I have a surge protector in the main panel
Dennis, Mudchief, had his Montana electrical system saved because he installed one in his unit.
This is a surge protector, it protects the electrical system against surges and spikes, it is not a all in one system check and voltage monitor.
But it is also only around $100.00
http://www.smarthome.com/4860/Levito...otector/p.aspx
http://www.smarthome.com/manuals/4860.pdf