Agreed, a surge protector only protects against surges. An EMS, (electrical management system) cost more money but protects you against more common problems like reverse polarity, low voltage, high voltage, missing ground wires, mis mired pedestals and a bunch more stuff.
Other campers and camping staff that are not properly trained mess around with the electrical pedestals and then cause you problems when you plug in.
My system even notified me of an outlet at my home that was miss wired for 20 years.
Worse case scenario of bad campground wiring or a storm could be you need to replace every electrical appliance in your RV. An EMS is cheap protection.
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