Several times we've encountered park electrical supply issues, and a couple of times low-amp voltage drop and adapter short circuit problems, but our SurgeGuard transfer switch kept the coach unharmed. Once it was a problem convincing the park owner/manager that the problem was his equipment and not ours, so having a quality, well-featured voltmeter on hand and some basic knowledge of circuitry is always advisable.
Steve's or other testing device is a good idea; some dedicated to just source testing are available at RV suppliers, and are small enough to be kept handy with or near your power cord cabinet. Admittedly I've been lazy about checking campsite outlets like I should, unless it looks old or disheveled. But the SurgeGuard's performance thus far has jaded my concern a bit.
Joel
