REG 4008 Form is used to declare weight on commercial vehicles.
All registered owners or lessees of commercial motor vehicles operating at 10,001 lbs. or more Gross Vehicle Weight (GVW) or Combined Gross Vehicle Weight (CGW) registered with the California Department of Motor Vehicles are required to declare the gross/combined gross weight at which their vehicle(s) will operate (see definitions below). Pickup trucks with no body type modifications (e.g., utility bed added, stake, etc.) and an unladen weight under 8,001 and a GVWR of 11,499 and under are excluded.