Hot skin issue please help

Found a bad ground on one early in the issue. But have tested continuity and resistance in the line and working my way thru every electrical system, outlet, visible wire, etc. But, I really think I was getting false readings from the non-contact variable meter...I have not been able to replicate anything for a couple of days. We will not be using the trailer for another month, so I have time to test every system and variables too.

Here is a great link to somebody else's test procedure:
http://www.sunlineclub.com/forums/f71/camper-grounding-to-prevent-electrical-schock-11647.html