1998 GMC Sonoma Owner's Manual - Page 206

If you're using a weight-carrying hitch, the trailer tongue (A) should weigh 10 percent of the total loaded trailer weight (B). If you're using a weight-distributing hitch, the trailer tongue (A) should weigh 12 percent of the total loaded trailer weight (B). After you've loaded your trailer, weigh the trailer and then the tongue, separately, to see if the weights are proper. If they aren't, you may be able to get them right simply by moving some items around in the trailer. Hitches It's important to have the correct hitch equipment. Crosswinds, large trucks going by and rough roads are a few reasons why you'll need the right hitch. Here are some rules to follow: 0 If you use a step-bumper hitch, your bumper could be damaged in sharpturns. Make sure you have ample room when turning to avoid contactbetween the trailer and the bumper. If you'll be pullinga trailer that, when loaded, will weigh more than 3,500 lbs. (1 589 kg), be sure touse a properly mounted, weight-distributing hitch and sway control of the proper size. This equipment is very important for proper vehicle loading and good handling when you're driving. If your vehicle has the bumper delete option, donot bolt any type of hitch to the close-out panel. The close-out panel will not support a hitch. Total Weight on Your Vehicle's Tires Be sureyour vehicle's tires are inflatedto the upper limit forcold tires. You'll find thesenumbers on the Certificatiomire label on the driver's door edge, above the door latch, or see "Tire Loading" in the Index. Then be sure you don't go overthe GVW limit for your vehicle, including the weight of the trailer tongue. 0 0 4-50