GMC 2000 Sonoma Owner's Manual page 199

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Refer to the Truck Camper Loading Information Label
on the passenger's door 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 for the Cargo Weight Rating (C) is
the point where the mass of a body is concentrated
and, if suspended at that point, would balance the front
and rear.
4-44
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.
Campers can only be installed in a long box pickup.
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Check your Truck Camper Loading Label on the
passenger's door to determine if your vehicle can carry a
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slide in camper.