GMC Sierra Classic 2007 Owner's Manual page 414

Q:
What is total vehicle reserve capacity?
A:
This is the difference between your GVWR and
the weight of your truck with full fuel and
passengers. It is the amount of weight you can
add to your vehicle before reaching your
GVWR. Keep in mind that reserve capacity
numbers are intended as a guide when
selecting the amount of equipment or cargo
your truck can carry. If you are unsure of your
vehicle's front, rear, or total weight, go to a
weigh station and weigh your vehicle.
Your dealer can also help you with this.
The total vehicle reserve capacity for your
vehicle can be found in the lower right corner
of the Certification/Tire label as shown
previously.
See your dealer for additional advice and
information about using a snow plow on your
vehicle. Also, see Loading Your Vehicle on
page 403.
414
Emergency Roof Lamp Provisions
Vehicles with the RPO VYU snow plow prep
package also have an emergency roof lamp
provision package, RPO TRW. Wiring for the
emergency roof lamp is provided in the B-pillar as
shown. See Auxiliary Roof Mounted Lamp on
page 224 for switch location.
A. Body Side Inner Panel
B. Emergency Roof Lamp Harness