GMC 2001 Sierra 1500 Pickup Owner's Manual page 276

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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.
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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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If your slide in camper and its load weighs less than
the CWR, the center of gravity zone for your vehicle
may be larger.