2004 Hummer H2 Owner's Manual - Page 306

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. When using a weight-distributing hitch, the hitch must be adjusted so that the distance (A) remains the same both before and after coupling the trailer to the tow vehicle. If you ll be pulling a trailer that, when loaded, will weigh more than 4,000 lbs. (1 814 kg) be sure to use 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 driving. You should always use a sway control if your trailer will weigh more than these limits. You can ask a hitch dealer about sway controls. Weight-distributing Hitches and Weight Carrying Hitches Safety Chains You should always attach chains between your vehicle and your trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Always leave just enough slack so you can turn with your rig. Never allow safety chains to drag on the ground. (A) Body-to-Ground Distance (B) Front of Vehicle 4-80