2006 GMC Envoy Owner's Manual - Page 342

Rear Towing (Rear Wheels Off the Ground) (Two-Wheel or Four-Wheel-Drive Vehicles) 4. Follow the dolly manufacturer's instructions to attach and secure the vehicle being towed to the dolly and then the loaded dolly to the tow vehicle. Use an adequate clamping device to ensure that the front wheels are locked into the straight position. 5. Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle. 6. Turn the ignition to LOCK. If the tow vehicle will not be started or driven for six weeks or more, remove the battery cable from the negative terminal (post) of the battery. Use the following procedure to tow your vehicle from the rear: 1. Drive the vehicle onto the dolly. 2. Firmly set the parking brake. See Parking Brake on page 2-31 for more information. 3. Shift the transmission in PARK (P). 4-54