1995 GMC Sonoma Owner's Manual - Page 174

Truck-Camper Loading Information Open your glove box and look for this label: This label will tell you if your vehicle can carry a slide-in camper, 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. The 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 seating position. The total cargo load must not be more than your vehicle's CWR. 4-40