At the California border you will be stopped and asked if you have any fruits or vegetables in your RV. They will take them from you.
California is one of the largest producers of fruits and vegetables and they want to keeps bugs/diseases out of here.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
The coldest winter I ever spent was a summer in San Francisco.