2008 Dodge Ram 2500 Pickup Owner Manual - Page 332

330 STARTING AND OPERATING Towing and Hauling with HSA (Vehicles Equipped with Automatic Transmissions Only) The HSA system does not know if your vehicle is loaded or towing a trailer, unless the TOW/HAUL button, located on the transmission gear shift lever, is selected. When activated, the TOW/HAUL light will illuminate in the instrument cluster. For more information on TOW/ HAUL mode, refer to "When To USE TOW/HAUL and O/D OFF Modes" under ЉAutomatic Transmission" in Section 5. In order to accommodate the extra weight entailed under towing and hauling conditions and to increase driver comfort while launching on a hill, the system recognizes when the TOW/HAUL button is activated and compensates by releasing brake pressure at a slower rate while throttle is applied in order to prevent the vehicle from rolling down the hill. WARNING! If you use a trailer brake controller with your trailer, your trailer brakes may be activated and deactivated with the brake switch. If so, when the brake pedal is released, there may not be enough brake pressure to hold the vehicle and trailer on a hill and this could cause a collision with another vehicle or object behind you. In order to avoid rolling down the incline while resuming acceleration, manually activate the trailer brake or apply more vehicle brake pressure prior to releasing the brake pedal. Always remember the driver is responsible for braking the vehicle.