Interesting.Interesting the response in #3 is complete opposite of what I hear today. I just chatted with a Rivian rep and was told some of the preproduction units had it on Front Right but the production version will be on Front Left (drivers Side) and will support a Nema 14/15 plug.
Doubt this will make the final version, but having a port on both sides will satisfy the most real world situations with short charging cords. I see this all the time with my Model Y in public stations with a single charger with 2 plugs.I prefer passenger side, due to my existing charger location. Better yet would be to offer a port on BOTH sides.