Perhaps take a good look at the wiring in some of the junk that comes out of Indiana by the big guys. Thor, Forest River, Winnebago, Grand Design etc. I think you would get a good surprise if you poke around the receptacles, shore power connectors, and AC side of converters / distribution panels, and know what your looking for.
Those RVIA decals are a feely good joke and mean nothing.
The RVIA certifies nothing. All that decal says is the manufacturer agrees to follow NFPA1192 which is the National Fire Protection Association. Its a good faith honor system thing as there is no inspector from the NFPA, RVIA, or anyone else in any RV factory anywhere. Read the decal, "Manufacturer certifies".