2004 GMC Sierra 1500 Pickup Owner's Manual - Page 381

Vehicle* Axle Ratio Maximum Trailer Weight GCWR 6.6L V8 Single Rear 3.73 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) Wheel K-3500 Extended Cab (4WD)* 6000 V8 Dual Rear 4.10 9,500 lbs. (4 309 kg) 16,000 lbs. (7 257 kg) Wheel 6000 V8 Single Rear 4.10 9,700 lbs. (4 399 kg) 16,000 lbs. (7 257 kg) Wheel 8100 V8 Dual Rear 4.10 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) Wheel 8100 V8 Single Rear 4.10 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) Wheel 6.6L V8 Diesel Dual 3.73 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) Rear Wheel 6.6L V8 Diesel Single 3.73 12,000 lbs. (5 443 kg) 22,000 lbs. (9 979 kg) Rear Wheel * Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,500 lbs. (1 587 kg) maximum. 4-85