Your 30amp circuits most likely only support 30 amps, do not switch to a 50a breaker, the wire is not sized correctly. I did mine myself, so unfortunately I don’t have a recommendation for you. Good luck.
Rivian did not offer to compensate me monetarily for having to do all this myself now, but hinted there may be some swag headed my way. My paperwork is in route. I signed a new BOS to prevent late fees that may have been assessed.
Update on my message above. Just got an email from my guide stating they are sending me all the paperwork to title the vehicle myself and will be refunding the TT&L I paid them for this. I have sent the guide an email back asking when I will receive my TT&L money and how they will compensate...
I did not, and am happy with my decision. Same use case as yours, drive 20-25k miles a year. I am a DYI guy and can fix a leak myself, or have roadside assistance if I have a major issue (never have with any other vehicle I have owned).