Thanks everyone! Had never seen this condition before but we knew it was not right. The autoformer sounds interesting, but given that this is the first time we experienced the low voltage, will probably hold off on purchasing.
It was a hot weekend so with all the A/C's going I did not think it would get better at our site. We checked one of the sites below us and it was 115 volts. Guess it was just bad luck. The campground did give us our money back as there were no other open sites, but then charged us $5 for cancelling. I just wanted to leave to get to the other CG.