GMC 2002 Sierra - Manual (Page 284)

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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:
Your warranty doesn’t cover parts or
components that fail because of overloading.
Remember not to exceed the Gross Axle Weight Rating
(GAWR) of the front or rear axle. See “Loading Your
Vehicle” in the Index.
*Equipment Maximum Weight
Ladder Rack and Cargo 750 lbs. (340 kg) . . . . . . . . . .
Cross Toolbox and Cargo 400 lbs. (181 kg) . . . . . . . . .
Side Boxes
and Cargo 250 lbs. per side (113 kg per side) . . . . .
* The combined weight for all rail - mounted equipment
should not exceed 1,000 lbs. (454 kg). A reinforcement
kit for rail
- mounted add - on equipment is recommended.
See your dealer.
Adding a Snow Plow or
Similar Equipment
Before installing a snow plow on your vehicle, here are
some things you’ll need to know:
NOTICE:
If your vehicle doesn’t have the snow plow prep
package, adding a plow can damage your vehicle,
and the repairs wouldn’t be covered by warranty.
Unless your vehicle was built to carry a snow
plow, don’t add one to your vehicle.
If your vehicle has the snow plow option called
RPO VYU (snow plow prep package), then the
payload your vehicle can carry will be reduced
when a snow plow is installed. Your vehicle can
be damaged if either the front or rear axle
ratings, or the GVW, are exceeded.