Would something like this electric water heater be good enough for this demonstration?
HW I don't really need an LP/Electric water heater for anything, so this electric-only version should be good enough for a proof-of-concept setup. But all of you need to agree that it's sufficiently close to what you're using in your own RVs.
I'm serious about doing a demonstration to disprove this old-wives-tale. Here's a link to my portable test bench where I demonstrate electrical grounding safety for musicians and big sound systems.
B&KI welcome any comments or suggestions on what you all would like to see.