2003 Mercedes ML-Class Owner's Manual - Page 195

Operation Driving instructions Adjust the mirrors to permit unobstructed view beyond rear of trailer. If the trailer has electric brakes, start your vehicle and trailer moving slowly, and then apply only the trailer brake controller by hand to be sure the brakes are working properly. Always secure items in the trailer to prevent load shifts while driving. When towing a trailer, check occasionally to be sure that the load is secure, and that lighting and trailer brakes (if so equipped) are functioning properly. Take into consideration that when towing a trailer, the handling characteristics are different and less stable from those when operating the vehicle without a trailer. It is important to avoid sudden maneuvers. The vehicle and trailer combination is heavier, and therefore is limited in acceleration and climbing ability, and requires longer stopping distances. It is more prone to reacting to side wind gusts, and requires more sensitive steering input. If possible, do not brake abruptly, but rather engage the brake slightly at first to permit the trailer to activate its brake. Then increase the braking force. If the transmission hunts between gears on inclines, manually shift to a lower gear (select 4, 3, 2 or 1). A lower gear and reduction of speed reduces the chance of engine overloading and/or overheating. On very steep inclines, not manageable with selector lever in position 1, switch transfer case to LOW RANGE mode ( page 118). When going down a long hill, shift into a lower gear and use the engine's braking effect. Avoid riding the brakes, thus overheating the vehicle and trailer brakes. ! If the trailer should begin to sway, reduce the vehicle's speed and use the brake controller by hand to straighten out the vehicle and trailer. In no case should you attempt to straighten out the tow vehicle and trailer by increasing the speed or oversteering and stepping on the brakes. 195