2010 Hummer H3 Owner's Manual - Page 260
2010 Hummer H3 Manual
Page 260 highlights
9-76 Driving and Operating Trailering may be limited by the vehicle's ability to carry tongue weight. Tongue weight cannot cause the vehicle to exceed the GVWR (Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Axle Weight Rating). The effect of additional weight may reduce the trailering capacity more than the total of the additional weight. Choose the shortest hitch extension that will position the hitch ball closest to the vehicle. This will help reduce the effect of trailer tongue weight on the rear axle. If the spare tire carrier is mounted on the back of the vehicle and the hitch extension is too short, the spare tire may interfere with trailer coupling or trailer tongue jack operation on some types of trailers. Ask your dealer for our trailering information or advice, or write us at our Customer Assistance Offices. See Customer Assistance Offices on page 13‑3 for more information. Weight of the Trailer Tongue The tongue load (A) of any trailer is an important weight to measure because it affects the total gross weight of the vehicle. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo carried in it, and the people who will be riding in the vehicle. If there are a lot of options, equipment, passengers or cargo in the vehicle, it will reduce the tongue weight the vehicle can carry, which will also reduce the trailer weight the vehicle can tow. If towing a trailer, the tongue load must be added to the GVW because the vehicle will be carrying that weight, too. See Vehicle Load Limits on page 9‑27 for more information about the vehicle's maximum load capacity. If a weight-carrying hitch or a weight-distributing hitch is being used, the trailer tongue (A) should weigh 10‐15 percent of the total loaded trailer weight (B) up to a maximum of 227 kg (500 lbs). After loading the trailer, weigh the trailer and then the tongue, separately, to see if the weights are proper. If they are not, adjustments might be made by moving some items around in the trailer.