Another vote for the Progressive Industries EMS. I have their 30 amp hardwired unit in my TT. We see low voltage codes so regularly that I decided to add a Hughes Autoformer, too. The Autoformer boosts voltage so we don’t get the low voltage shut downs anymore.
I’ve never seen a “surge” but one campground did have a pedestal mis-wired which caused a hot skin condition for a neighbor.
One negative for the hardwired version is that you have to plug the trailer into the pedestal for it to let you know if there is a problem. I bought this portable device to check the pedestal even before backing into a site.
https://www.amazon.com/Prime-Product.../dp/B000BRFTH6
It has a typical household 3-prong plug on the back so I just use a dog bone adapter to plug it into the 30A receptacle on the pedestal.