2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 391

Loading Your Vehicle for Off-Road Driving There are some important things to remember about how to load your vehicle. . { WARNING: . . The heaviest things should be on the floor, forward of the rear axle. Put heavier items as far forward as you can. Be sure the load is properly secured, so things are not tossed around. Cargo on the load floor piled higher than the seatbacks can be thrown forward during a sudden stop. You or your passengers could be injured. Keep cargo below the top of the seatbacks. Unsecured cargo on the load floor can be tossed about when driving over rough terrain. You or your passengers can be struck by flying objects. Secure the cargo properly. Heavy loads on the roof raise the vehicle's center of gravity, making it more likely to roll over. You can be seriously or fatally injured if the vehicle rolls over. Put heavy loads inside the cargo area, not on the roof. Keep cargo in the cargo area as far forward and low as possible. You will find other important information under Loading the Vehicle on page 5‑33 and Tires on page 6‑70. . . 5-15