2008 Hummer H3 Owner's Manual - Page 247

If You Do Decide To Pull A Trailer If you do, here are some important points: • If you have an automatic transmission, you can tow in DRIVE (D). You may want to shift the transmission to THIRD (3) or, if necessary, a lower gear if the transmission shifts too often under heavy loads and/or hilly conditions. If you have a manual transmission and you are towing a trailer, it is better not to use the highest gear. Three important considerations have to do with weight: • There are many different laws, including speed limit restrictions, having to do with trailering. Make sure your rig will be legal, not only where you live but also where you'll be driving. A good source for this information can be state or provincial police. • Consider using a sway control. See "Hitches" later in this section. • Don't tow a trailer at all during the first 500 miles (800 km) your new vehicle is driven. Your engine, axle or other parts could be damaged. • The weight of the trailer • The weight of the trailer tongue • And the weight on your vehicle's tires • Then, during the first 500 miles (800 km) that you tow a trailer, don't drive over 50 mph (80 km/h) and don't make starts at full throttle. This helps your engine and other parts of your vehicle wear in at the heavier loads. 4-51