A surge suppressor is a good idea especially if you plan on using any mobile devices in the coach (charging cell phones, laptop, etc.) as these items are even more sensitive to transients on the power line.
I frequently use the 20A to 30A plug at home to keep the batteries charged up (and in a pinch run the A/C as long as the wife doesn't run the hairdryer and the refer in the garage doesn't kick in).
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