2003 GMC Sierra 1500 Pickup Owner's Manual - Page 361

* 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). maximum. ** Limited to 12,000 Ibs. (5 443 kg) with weight distributing hitch). 4-80