One of those testers is good to have, but a surge protector/EMS is a MUST HAVE for ALL rvs in my opinion. Yes they are pricey, but so is a fridge, microwave, & 2 or 3 televisions along with lots of other sensitive electronics onboard. Portable or hard wired will protect your rv from faulty campground wiring & help you diagnose whether it's your problem or theirs.
As to your current issue, if it worked at your last stop or at home it's most likely the campground pedestals are the problem, now to just convince them.
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