2010 Hummer H3 Owner's Manual - Page 255

Driving and Operating With the added weight, the engine, transmission, wheel assemblies and tires are forced to work harder and under greater loads. The trailer also adds wind resistance, increasing the pulling requirements. For safe trailering, correctly use the proper trailering equipment. The following information has important trailering tips and rules for your safety and that of your passengers. Read this section carefully before pulling a trailer. . 9-71 Do not tow a trailer at all during the first 800 km (500 miles) the new vehicle is driven. The engine, axle or other parts could be damaged. Then, during the first 800 km (500 miles) that a trailer is towed, do not drive over 80 km/h (50 mph) and do not make starts at full throttle. This helps the engine and other parts of the vehicle wear in at the heavier loads. Vehicles with an automatic transmission can tow in D (Drive). Use a lower gear if the transmission shifts too often. For vehicles with a manual transmission, it is better not to use the highest gear. This vehicle has a Hill Start Assist feature, which may be useful when the vehicle is stopped on a grade. See Hill Start Assist (HSA) on page 9‑52 for more information. . Do not drive faster than the maximum posted speed for trailers. Driving with a Trailer Towing a trailer requires experience. Get familiar with handling and braking with the added trailer weight. The vehicle is now longer and not as responsive as the vehicle is by itself. Check all trailer hitch parts and attachments, safety chains, electrical connectors, lamps, tires and mirror adjustments. If the trailer has electric brakes, start the vehicle and trailer moving and then apply the trailer brake controller by hand to be sure the brakes are working. During the trip, check occasionally to be sure that the load is secure, and the lamps and trailer brakes are working properly. . Pulling A Trailer Here are some important points: . . There are many laws, including speed limit restrictions that apply to trailering. Check for legal requirements with state or provincial police. Consider using a sway control. See "Hitches" later in this section. . .