GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 416

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.
Remember not to exceed the Gross Axle Weight
Rating (GAWR) of the front or rear axle.
Ladder Rack and
Cargo
Cross Toolbox and
Cargo
Side Boxes and Cargo
* The combined weight for all rail mounted
equipment should not exceed 1,000 lbs (454 kg).
5-40
750 lbs (340 kg)
400 lbs (181 kg)
250 lbs per side (113 kg
per side)
A. Primary Load Points
B. Secondary Load Areas
C. Cargo Management Option Holes
Structural members (A) and (B) are included in the
pick-up box design. Additional accessories should use
these load points. Depending on the accessory design,
use a spacer under the accessory at the load points to
remove gap. The holes for the Cargo Management
System (C) are not intended for attachment of