Chevrolet 2008 Colorado Owner's Manual page 244

Certification/Tire Label
Label Example
A vehicle specific Certification/Tire label is
attached to the bottom section of the center pillar,
on the driver's side of the vehicle. Vehicles
without a center pillar, like extended cab models,
will have the Certification/Tire label attached to
the edge of the driver's side, extended cab door,
below the door latch post. The label shows
the Gross Vehicle Weight Rating (GVWR).
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The GVWR includes the weight of the vehicle,
all occupants, fuel, cargo, and trailer tongue
weight, if pulling a trailer.
The Certification/Tire label also tells you the
maximum weights for the front and rear axles,
called Gross Axle Weight Rating (GAWR).
To find out the actual loads on your front and
rear axles, you need to go to a weigh station and
weigh your vehicle. Your dealer can help you
with this. Be sure to spread out your load equally
on both sides of the centerline.
Never exceed the GVWR for your vehicle, or the
GAWR for either the front or rear axle.
If you do have a heavy load, you should spread
it out.
Similar appearing vehicles may have different
GVWRs and capacity weights. Please note your
vehicle's Certification/Tire label or consult
your dealer/retailer for additional details.