2004 GMC Sonoma Owner's Manual - Page 229

Refer to your vehicle's tire and loading information label for specific information about your vehicle's capacity and seating positions. The combined weight of the driver, passengers and cargo should never exceed your vehicle's capacity weight. Certification/Tire Label The Certification/Tire label is found on the driver's door edge, above the door latch. The label shows the size of your original tires and the inflation pressures needed to obtain the gross weight capacity of your vehicle. This is called the Gross Vehicle Weight Rating (GVWR). The GVWR includes the weight of the vehicle, all occupants, fuel, cargo and trailer tongue weight, if pulling a trailer. 4-49