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An EMS is the best way to go. I installed a Progressive Industries hardwired EMS-HW50C. I have it wired on the output of the transfer switch to also protect from any potential issues from the generator (I figure a transfer switch is much less expensive than an A/C or fridge of the generator every malfunctions).
I configured the EMS so it does not supply power to the coach for 136 seconds after it has verified the power coming into the coach is safe. This protects the A/C and refrigerator compressors from damage when power is rapidly cycling on and off.
I just experienced a situation where the EMS did its job very well. We were in Vermont a couple weeks ago and a storm kicked up just as we went to bed. The A/C's were running when the power went out and cycled quickly on and off 2 or 3 times before going out completely for about 2 hours.
The transfer switch is right under our bed and I could hear the relays buzzing and trying to engage as the power was cycling on and off and surging but the delay I have set prevented any of that bad power from entering the coach and causing damage. My EMS paid for itself that night.
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