GMC 2011 Sierra Denali Owner's Manual page 281

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.
Add-On Equipment
When you carry removable
items, you may need to put a
limit on how many people you
carry inside your vehicle.
Be sure to weigh your vehicle
before you buy and install the
new equipment.
Notice : Overloading the
vehicle may cause damage.
Repairs would not be covered
by the vehicle warranty.
Do not overload the vehicle.
Remember not to exceed the
Gross Axle Weight Rating
(GAWR) of the front or rear axle.
Driving and Operating
Maximum
*Equipment Weight
Ladder Rack 340 kg
and Cargo (750 lbs)
Cross Toolbox 181 kg
and Cargo (400 lbs)
Side Boxes 113 kg per
and Cargo side (250 lbs
per side)
*The combined weight for
all rail-mounted equipment
should not exceed 454 kg
(1,000 lbs). A reinforcement kit
for rail mounted add on
equipment is recommended.
See your GM dealer.
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