2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 378

6. Use an adequate clamping device designed for towing to ensure that the front wheels are locked into the straight position. Towing a Trailer If the vehicle has a diesel engine, see the DURAMAX® Diesel manual for more information. Do not tow a trailer during break-in. See New Vehicle Break-In on page 2-21 for more information. { CAUTION: Shifting a four-wheel-drive vehicle's transfer case into N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). The driver or others could be injured. Make sure the parking brake is firmly set before the transfer case is shifted to N (Neutral). 7. Shift the transfer case to N (Neutral). See "Shifting into Neutral" under Four-Wheel Drive on page 2-36 for the proper procedure to select the neutral position for the vehicle. 8. Turn the ignition to LOCK/OFF. After towing, see "Shifting Out of Neutral" under Four-Wheel Drive on page 2-36. { CAUTION: The driver can lose control when pulling a trailer if the correct equipment is not used or the vehicle is not driven properly. For example, if the trailer is too heavy, the brakes may not work well or even at all. The driver and passengers could be seriously injured. The vehicle may also be damaged; the resulting repairs would not be covered by the vehicle warranty. Pull a trailer only if all the steps in this section have been followed. Ask your dealer/retailer for advice and information about towing a trailer with the vehicle. 4-50