GMC 2005 Sierra Denali Owner's Manual page 255

CAUTION:
{
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's also important loading information for off-road
driving in this manual. See "Loading Your Vehicle
for Off-Road Driving" under Operating Your
All-Wheel-Drive Vehicle Off Paved Roads on page 4-13.
Two-Tiered Loading
By positioning four 2" x 6" 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 3/4 inch (2 cm) bearing surface on
each end of the plank.
When using this upper load platform, be sure the load is
securely tied down to prevent it from shifting. The
load's center of gravity should be positioned in a zone
over the rear axle. The zone is located in the area
between the front of each wheel well and the rear of
each wheel well. The center of gravity height must not
extend above the top of the pickup box flareboard.
Any load that extends beyond the vehicle's taillamp area
must be properly marked according to local laws and
regulations.
Remember not to exceed the Gross Axle Weight
Rating (GAWR) of the front or rear axle.
4-47