So please read this article I've written about hot-skin testing trailers using a Fluke VoltAlert: RV Electrical Safety: Part IV ? Hot Skin | No~Shock~Zone...
I've also done a video that shows how to do this simple hot-skin test on a full size 40 ft toyhauler trailer:
‪howtoseminars's Channel‬‏ - YouTube
Both links include articles about extension cord overheating, understanding volts and amps, and picking a surge or voltage protector for your trailer.
We're now planning a series of No~Shock~Zone seminars around the country to teach electrical safety for RVs and trailers of all types. Please contact me if your group might be interested in hosting a seminar at your rally or event.
Also, please let me know if you think this information should be posted on any other forum here, possibly under horse health.