I have been charging my Tesla from a 50A outlet using the Tesla Gen3 mobile connector for about two years. When my Rivian arrives it will be my second vehicle and I'll probably start by just charging from a 15A outlet. After we've piled up some more money I'd like to get a Tesla Wall Connector and hardwire it at that same 50A outlet location, and get a Rivian wall connector to mount at the appropriate location for it.
If you're going to be at a place for a reasonable amount of time, two or more years, I think it's worth getting the wall connector installed with a 60 amp circuit. Keep in mind that "continuous load" on a circuit in North America is 80% of the peak load. The Rivian wall connector peaks at 11.5kW which is
[email protected] which is 80% of 60A.
Tesla no longer includes a mobile connector with the vehicle. I believe they are attempting to encourage people to purchase and install the wall connector. It's FAR better for daily use even if it's just connected to the same 15A circuit. Everything about it is more durable and ready for the repeated daily abuse. I suspect Rivian is the same.