Seven round terminal or seven flat terminal?
It seems to me that in RV use seven flat is the standard, and that in general they follow standard protocol from the factory, but you never know when an individual owner will deviate from standard fare and switch things up.
Whatever someone has done, I always recommend returning to standard pin placement in the plugs.
That said, the wiring between the plug and lights on my 72 was just the tip of the iceberg of the 12V
wiring... (There are a lot of wires in these campers) So I ripped it all out and went with a more simplistic plan...