California Code, Vehicle Code - VEH § 6850

A nonresident owner of any foreign commercial vehicle shall register the vehicle in this state and pay the fees applicable thereto under this code, except as provided in this article and Article 3 (commencing with Section 8000), and except in the event the vehicle is lawfully registered as a private passenger vehicle in the foreign jurisdiction in which the owner has residence, in which case Section 6700 shall apply.