Not very many RV parks in San Francisco, so I recommend the KOA in Petaluma. It is right near Hwy 101. Then a day trip into SF in your toad, over the golden gate bridge, toll going south, free coming back to Petaluma. That way you can scout out your route through SF if you decide to continue later on 101 in the MH. Lots to see and do in SF, just not very RV friendly for driving. About the toll going south over the golden gate, I think they take a picture of your vehicle license plate and mail you a bill for the toll but not really sure how it works for out of state vehicles. Maybe someone will chime in later.
KOA Petalumagolden gate bridge toll