Pontiac 2002 Firebird - Manual (Page 203)

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The other label is the Certification label, found on the
rear edge of the driver’s door. It tells you the gross
weight capacity of your vehicle, called Gross Vehicle
Weight Rating (GVWR). The GVWR includes the
weight of the vehicle, all occupants, fuel and cargo.
Never exceed the GVWR for your vehicle, or the
Gross Axle Weight Rating (GAWR) for either the front
or rear axle.
And, if you do have a heavy load, you should spread
it out. Don’t carry more than 100 lbs. (45 kg) in your
rear area.
CAUTION:
Do not load your vehicle any heavier than the
GVWR, or either the maximum front or rear
GAWR. If you do, parts on your vehicle can
break, and it can change the way your vehicle
handles. These could cause you to lose control
and crash. Also, overloading can shorten the life
of your vehicle.