I use both a surge protector at the box and a Power Master voltage regulator hard wired into the trailer.
When we first got the trailer and going out camping we looked for surge protection and found one that not only protected for surges but checked the wiring of the campground to make sure it was good. This has saved my butt a couple of times. Then after visiting some campgrounds in the summer time when everyone had the AC on I noticed voltage drop to an unsafe value for items like my AC. Then after doing some reading both here and other boards I hound the need for voltage regulator that could boost the voltage when needed. Like the autoformer and the power master it will protect surges to the system and help regulate the voltage. A little long winded but I think the cost is well worth the piece of mind.
just my two cents
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George and Debi
2006 F250 PSD, 2005 PF30CK
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