Gary,
We were in a CG in Columbus, GA and I had a similar problem. I plugged into the power pole and everything worked fine; 120V on each leg and everything inside the coach worked normally.
When we returned about 10PM everything was off! No power at the power pedestal on either leg AND THE 50 AMP BREAKER WAS NOT TRIPPED! I ran the generator and complained to the office the next morning.
Come to find out, there was a second 50 amp breaker on the main distribution center for the campground (I'm sure that is the wrong terminology) that was worn out. They replaced it and no more problems.
So the problem was not my coach and it was not the 50 amp breaker on the power pedestal. Go figure!
Tuga & Karen Gaidry
2012 Honda Pilot