When in a commercial CG I always use a surge protector. I plug the S/P into the pedestal and turn on the breaker. The S/P will indicate a neutral ground and any reverse wired conditions. If the S/P indicates all is well, I turn breaker off and connect to TC umbilical cord and turn the breaker at the pedestal back on.
The S/P hopefully will complete it's job of protecting my camper from any electrical surges. As others have mentioned, good idea to use a good quality surge protector.
Lakeside