GMC 2011 Sierra Denali Owner's Manual page 280

9-28 Driving and Operating
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.
WARNING
Things you put inside your
vehicle can strike and injure
people in a sudden stop or
turn, or in a crash.
Put things in the cargo
area of your vehicle. Try to
spread the weight evenly.
Never stack heavier
things, like suitcases,
inside the vehicle so that
some of them are above
the tops of the seats.
Do not leave an
unsecured child restraint
in your vehicle.
When you carry something
inside the vehicle, secure
it whenever you can.
Do not leave a seat folded
down unless you need to.
There is also important loading
information for off-road driving in
this manual. See Loading Your
Vehicle for Off-Road Driving
under Off-Road Driving on
page 9 7 .
Two-Tiered Loading
By positioning four 5 cm (2 in) by
15 cm (6 in) wooden planks
across the width of the pickup
box, you can create an upper
load platform. The planks must
be inserted in the pickup box
depressions. The length of the
planks must allow for at least a
2 cm (0.75 in) bearing surface on
each end of the plank.