2011 Mercedes R-Class Owner's Manual - Page 196
2011 Mercedes R-Class Manual
Page 196 highlights
194 Towing a trailer Make sure that you do not operate the ADS switch or the vehicle level control system when coupling/decoupling the trailer. Driving and parking Observe the maximum permissible trailer dimensions (width and length). Most federal states and all Canadian provinces require by law: Rsafety chains between the towing vehicle and the trailer. The chains should be crosswound under the trailer drawbar. They must be fastened to the vehicle's trailer coupling, not to the bumper or the axle. Allow for enough play in the chains to facilitate turning tight corners. Ra separate brake system for certain types of trailer. Ra safety switch for braked trailers. Check the specific legal requirements applicable to your federal state. If the trailer detaches from the towing vehicle, the safety switch applies the trailer's brakes. i Vehicles with the AIRMATIC package: with a trailer attached, the vehicle will always remain at highway level. When coupling up a trailer, please observe the following: Rif highway level has not been set manually, the vehicle will automatically sink to highway level as soon as it reaches a speed of 5 mph (8 km/h). Rhigh-speed level is not available. These restrictions apply to all accessories powered through a connection to the trailer power socket of your vehicle, e.g. a bicycle carrier. Towing a trailer There are numerous legal requirements concerning the towing of a trailer, e.g. speed restrictions. Make sure that your vehicle/ trailer combination complies with the local requirements not only in your area of residence but also at any location to which you are traveling. The police and local authorities can provide reliable information. Please observe the following when towing a trailer: RTo ! Do not connect the trailer's brake system (if featured) to the hydraulic brake system of the towing vehicle, as the latter is equipped with an anti-lock brake system. Doing so will result in a loss of function of the brake systems of both the vehicle and the trailer. i The vehicle's wiring harness features a line to the brake indicator lamp. X Make sure that the automatic transmission is set to position P. X Apply the vehicle's parking brake. X Start the engine. X Vehicles with the AIRMATIC package: select highway level and set ADS to AUTO or COMF. X Switch off the engine. X Close all doors and the tailgate. X Couple up the trailer. X Establish all electrical connections. acquaint yourself with driving with a trailer and with the resulting changes to handling, you should practice cornering, stopping and reversing in a traffic-free location. RBefore driving, check: - the trailer coupling - the safety switch for braked trailers - the safety chains - the electrical connections - the lights - the wheels RAdjust the exterior mirrors to provide an unobstructed view of the rear section of the trailer. RIf the trailer features electronically controlled brakes, pull away the vehicle/