Yes, the electrical management systems provide protection over not having one. An electric heater or fireplace may not be sensitive to over/under voltage, but electronics, fridges, etc are. Most tv's don't have a management system and even those that do may be on another transformer than you. Your experience may just be crappy utility service regulation to the park or part of it.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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