Rivian themselves have stated it isn't going to provide power to a house a large battery pack/generator. It is intended to power various power tools, and camping things but not a panel of household items. I understand you want this to happen but there are software issues they need to solve for this. I believe Lucid stated they will do this but it requires their charger hooked up to the car to provide power from the car to the house.It it’s well documented please provide sources. I have seen tests of it running power tools and other comparable loads so a small panel should be irrelevant if it is only pulling 500-800W.
I think it is useful to have this discussion for both my attempted use case or similar cases where people want to power a small camping adventure or tear drop