GMC Sierra Denali Owner's Manual page 258

Refer to the Truck-Camper Loading Information label in
glove box for dimensions A and B as shown in the
following illustration.
Use the rear edge of the load floor for measurement
purposes. The recommended location for the cargo
center of gravity is at point C for the CWR. It is the point
where the mass of a body is concentrated and, if
suspended at that point, would balance the front and rear.
Here is an example of proper truck and camper match:
A. Camper Center of Gravity
B.
Recommended Center of Gravity Location Zone
The camper's center of gravity should
fall
within
the center of gravity zone for your vehicle's cargo load.
You must weigh any accessories or other equipment
that you add to your vehicle. Then, subtract this
extra weight from the CWR. This extra weight may
shorten the center of gravity zone of your vehicle. Your
dealer can help you with this.
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