GMC Sierra 2008 Owner's Manual page 361

C-1500 Regular Cab
Long Box (2WD)*
4.3L V6
4.8L V8
5.3L V8
*Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs (680 kg) maximum.
**The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and
trailer including any passengers, cargo, equipment and conversions. The GCWR for your vehicle should not be
exceeded.
C-1500 Extended Cab
Long Box (2WD)*
5.3L V8
*Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs (680 kg) maximum.
**The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and
trailer including any passengers, cargo, equipment and conversions. The GCWR for your vehicle should not be
exceeded.
Axle Ratio Maximum Trailer Weight
3.23 4,700 lbs (2 132 kg)
3.73 5,200 lbs (2 359 kg)
3.23 5,100 lbs (2 313 kg)
3.73 7,100 lbs (3 221 kg)
3.42 7,000 lbs (3 175 kg)
3.73 8,000 lbs (3 629 kg)
Axle Ratio Maximum Trailer Weight
3.42 6,500 lbs (2 948 kg)
3.73 7,500 lbs (3 402 kg)
GCWR**
9,500 lbs (4 309 kg)
10,000 lbs (4 536 kg)
10,000 lbs (4 536 kg)
12,000 lbs (5 448 kg)
12,000 lbs (5 443 kg)
13,000 lbs (5 896 kg)
GCWR**
12,000 lbs (5 443 kg)
13,000 lbs (5 897 kg)
4-59