Fault in electric post???

I'm camped in a USFS campground and I've got one of those surge protectors. I have stayed at many campgrounds and never had a problem. Now my surge protector is showing reverse polarity and faulty ground. A little while ago, the local concessionaire from recreations resources (identified as the regional manager),came by and said it was probably my rig and not the post??? He said they recently upgraded the wiring throughout the campground and they've never had any complaints before. I explained that know one has probably had anything to identify the problem. I asked if they could send someone by to insure there is not a problem and to insure there was no shock risk. I don't think he liked me questioning his knowledge about electricity? Is there a problem or potential problem? I was thinking of taking my concern to the local USFS office, because I don't have much confidence in this guy? Advise?