We are traveling in California in August 2007 with 7 people for 20 days.
The normal Rental Car would be a Dodge Caravan or similar.
But i also found that you can rent a Ford Conversion Van, wich would be a bit bigger for 7 people.
The only offer i found so far was in Los Angeles and i didnt find anything in San Francisco after looking in the internet for 2 hours.
maybe i find something here.
Thanks for your help!