Take a look at the Hughes Power Watchdog. They are available for either 30 or 50 amp service and have all the power protection you are looking for. Will shut down power to the motorhome on over voltage, under voltage, over current, and open neutral. Error codes displayed on the front and the face turns from white to red. Also have a Bluetooh app for your phone that lets you monitor everything from inside the coach. You can see why the power was interrupted and also monitor the voltage and current under normal conditions. I love this app and use it all the time.
Here is a link to the 50 amp version on Amazon:
https://tinyurl.com/2zzfclx2
Here is a screenshot from my phone of one in use:
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