Many here use what I also use - Progressive Industries products. It is more than just a surge protector. It checks for multiple different types of faults. I use the PTC-50, which plugs into the pedestal. It is the first thing I do when I pull in. I plug it in and make sure there are no error codes at the pedestal. That way I don't waste time leveling and unhooking, only to find the site has an open ground or low voltage. In the 5 years I have had mine it has saved me about 4 times from wasting that time. It has alerted me to low voltage a few times and has shown me open grounds at least another 3 times. It has also disconnected me a half dozen times or more for reasons unknown; probably surges or spikes, I imagine. It is funny how the parks always want to tell me something is wrong with my monitor, until their maintenance guy tests the pedestal and finds out I am right.
My only concern is that the system could shut down my rig in the summer and kill the A/C when the dogs are in their and we are at the beach. Just in case, I always keep the Fantastic Fan on to vent some hot air if that happens. We are never gone for more than a few hours anyway.
They are a bit pricey (mine was $399), but it has a lifetime warranty and is much cheaper than rewiring your rig or replacing an A/C that failed due to low voltage brownout. In fact (full disclosure), my PTC-50 failed last month and I just dropped it off at Progressive (they are here in NC) and they are going to send me a new one - no charge.
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