1995 GMC Sonoma Owner's Manual - Page 172

There's also important loading information for off-road driving in this manual. See "Loading Your Vehicle" in the Index. Two-Tiered Loading By positioning four 2" x 6" wooden planks across the width of the pickup box, you can create an upper load platform. The planks must be inserted in the pickup box depressions. The length of the planks must allow for at least 3/4" bearing surface on each end of the plank. When using this upper load platform, be sure the load is securely tied down to prevent it from shifting. The load's center of gravity should be positioned in a zone overthe rear axle. The zone is located in the area between the of front of each fenderwell and the rear ofeach fenderwell. The center gravity height must not extend above the top of the pickup box flareboard. Any load that extends beyond the vehicle's taillamp area must be properly marked according to local laws and regulations. Remember not to exceed the Gross Axle Weight Rating (GAWR) of the rear axle. See "Loading Your Vehicle" in the Index. Payload The Payload Capacity is shown on the Certification/Tire label. This is the maximum load capacity that your vehicle can carry. Be sure to include the weight of the people inside as part of your load. If you added any accessories or equipment after your vehicle left the factory, remember to subtract the weight of these things from the payload. Your dealer can help you with this. 4-38