Surge Protector question - need advise - long - sorry!

I installed the hardwired 50 amp version. I wired it in and installed behind my breaker box. Gives me a sense of security when I plug in. It did detect low voltage at a state campground and did not let the juice flow. Maintenance people thought I was crazy when I told them they had a problem because "none of the others in the campground had a problem". I just told them that the others did have a problem, they just didn't know it yet.