GMC 1999 Sierra 1500 Pickup Owner's Manual page 348

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Service & Appearance Care
Truck-Camper Loading Information
Open your glove box door and look for this label:
PO338
This label will tell you how much of a load your vehicle can carry, and how
to spread out your load the right way. Also, it will help you match the right
slide-in camper to your vehicle.
When you carry a slide-in camper, the total cargo load of your vehicle is the
weight of the camper, plus
everything else added to the camper after
it
left the factory;
everything in the camper; and
all the people inside.
I
ne Cargo Weight Rating (CWR) is the maximum weight of the load your
vehicle can carry. It doesn't include the weight of the people inside. But, you
can figure about 150 pounds for each seat.