Surge Guard w/ ? Power pedestal - how do you handle this?

Always trust the surge protector. We have a Progressive 50amp installed. Last summer in Utah we plugged into a camp pedestal and the Progressive rejected the power. Turned out that the voltage was less than 105v. We checked 2 other sites and came up empty. The owner called the power company and they replaced a busted transformer that fed the front half of the campground. Thankfully no damage done and a happy campground owner who had a problem solved that he didn't know he had.