This company rents 12-15 passenger vans. That would give you plenty of room for your luggage.http://reservations.airportvanrental.com��
I have very good experience with http://www.vanrentalcalifornia.com. They have all kinds of vans you need. I have submitted an online quote application for San Francisco few weeks back and they have come up with 2 good deals in SFO.Looks like they have tie up with major van companies and give you a discounted rate. Also, you can save your valuable time in calling all these companies. At the end of the day, you will get a good deal. What else matters?I have tried other popular car rental companies and they do not have 10 seater vans. Good luck!Ron
If you are spending any time in the city (San Francisco), it is difficult to find parking for such vehicles.