2011 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 394

9-110 Driving and Operating . When pulling a heavy trailer or a large or heavy load in stop-and-go traffic. When pulling a heavy trailer or a large or heavy load in busy parking lots where improved low speed control of the vehicle is desired. Integrated Trailer Brake Control System . This indicator light on the instrument panel cluster comes on when the Tow/Haul Mode is on. Tow/Haul is a feature that assists when pulling a heavy trailer or a large or heavy load. See Tow/Haul Mode on page 9‑46 for more information. Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle's Gross Combined Weight Rating (GCWR). See "Weight of the Trailer" under Trailer Towing on page 9‑89. Tow/Haul is most useful under the following driving conditions: . Operating the vehicle in Tow/Haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/ Haul is recommended only when pulling a heavy trailer or a large or heavy load. The vehicle may have an Integrated Trailer Brake Control (ITBC) system for electric trailer brakes. This symbol is located on the Trailer Brake Control Panel on vehicles with an Integrated Trailer Brake Control system. The power output to the trailer brakes is based on the amount of brake pressure being applied by the vehicle's brake system. This available power output to the trailer brakes can be adjusted to a wide range of trailering situations. When pulling a heavy trailer or a large or heavy load through rolling terrain.