Gilbert Ray Campground, AZ - beware of open ground circuit

I ended up depositing the fee envelope with a "ATTN: MAINTENANCE DEPT" on the outside with a description of the problem.

We stayed another night - our camper is about 4 years old and is still in pretty good condition - probably no electric leaks to ground and the exterior skin is not metal.
People in the aluminum Airstream trailers might think differently though.