Thanks, guys. I found the BoatUS site and got lots more info on this topic. I've ordered the Prime Products 12-4058 AC Power Line Monitor and I'll use it before connecting every time.
Can I use it at the power pedestal to check polarity before connecting and then plug it in inside to monitor voltage?
What's your experience when you find a problem with a pedestal, either with the polarity or voltage?
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)