Those of us that have ems systems, I have the progressive industries ems-pt50x, use them because we feel that park power is not always reliable and don't want our units damaged by park faults. I have seen grounds come and go, low power on one leg of the 50 amp service, saw high cycles per second in one park in the smokey mtns.
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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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