GMC 2009 Sierra - Manual (Page 296)

The Certification/Tire label also tells the maximum
weights for the front and rear axles, called
Gross Axle Weight Rating (GAWR). To find out
the actual loads on the front and rear axles, 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.
The Certification/Tire label also contains important
information about the Front Axle Reserve
Capacity.
{ CAUTION:
In the case of a sudden stop or collision,
things carried in the bed of your truck
could shift forward and come into the
passenger area, injuring you and others. If
you put things in the bed of your truck,
you should make sure they are properly
secured.
{ CAUTION:
Do not load your vehicle any heavier than
the Gross Vehicle Weight Rating (GVWR),
or either the maximum front or rear Gross
Axle Weight Rating (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.
Notice: Overloading your vehicle may cause
damage. Repairs would not be covered by your
warranty. Do not overload your vehicle.
Using heavier suspension components to get
added durability might not change the vehicle’s
weight ratings. Ask your dealer to help you
load your vehicle the right way.
If things are put inside your vehicle — like
suitcases, tools, packages, or anything else — they
go as fast as the vehicle goes. If you have to stop
or turn quickly, or if there is a crash, they will keep
going.
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