2003 GMC Sierra 1500 Pickup Owner's Manual - Page 360

Vehicle* Axle Ratio Maximum Trailer Weight K-2500 Regular Cab Long Box HD (4WD)* I I I GCWR * Tongue weight should be 10 percent to 15 percent of trailer weight up to 1,500 Ibs (680 kg). Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,000 Ibs. (1 360 kg) maximum. ** Limited to 12,000 Ibs. (5 443 kg) with weight distributing hitch. * Tongue weight should be 10 percent to 15 percent of trailer weight up to 1,500 Ibs (680 kg). Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,000 Ibs. (1 360 kg) maximum. ** Limited to 12,000 Ibs. (5 443 kg) with weight distributing hitch. 4-79