2010 Hummer H3 Owner's Manual - Page 262

9-78 Driving and Operating The rear bumper on the vehicle is not intended for hitches. Do not attach rental hitches or other bumper-type hitches to it. Use only a frame-mounted hitch that does not attach to the bumper. Will any holes be made in the body of the vehicle when the trailer hitch is installed? If there are, then be sure to seal the holes when the hitch is removed. If the holes are not sealed, dirt, water, and deadly carbon monoxide (CO) from the exhaust may get into the vehicle. See Engine Exhaust on page 9‑40. Weight-Distributing Hitches and Weight Carrying Hitches Total Weight on the Vehicle's Tires Inflate the vehicle's tires to the upper limit for cold tires. These numbers can be found on the Certification label or see Vehicle Load Limits on page 9‑27. Do not go over the GVW limit for the vehicle, or the GAWR, including the weight of the trailer tongue. Towing Equipment Hitches It is important to have the correct hitch equipment. Crosswinds, large trucks going by and rough roads are a few reasons why the right hitch is needed. (A) Body-to-Ground Distance (B) Front of Vehicle 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.