from the act at the CA DMV:
Q - Does the CommercialVehicleRegistrationAct law affect all truck owners?
A - No. This law does not affect:
Pickups, as defined, that weigh under 8,001 lbs. unladen. [pickups with a box]
Lightweight trucks, vans, taxis, and rental limousines (including charter-party carriers operating limousines that pick up and deliver airport passengers), if the vehicle's GVW is 10,000 pounds or less.
Bill