1998 Ford Expedition Owner Guide 1st Printing - Page 121

Driving is properly attached to your vehicle. See your dealer or a reliable trailer dealer if you require assistance. If your vehicle is not equipped with the factory heavy duty trailer tow option, auxiliary coolers are recommended for the automatic transmission system if you are planning on: • traveling farther than 80 km (50 miles) • towing in hilly terrain • towing frequently Hitches Do not use hitches that clamp onto the vehicle's bumper or attach to the axle. You must distribute the load in your trailer so that 10 to 15% of the total weight of the trailer is on the tongue. Load equalizing hitch When hooking up a trailer using a load equalizing hitch, always use the following procedure: 1. Park the unloaded vehicle on a level surface. With the ignition on and all doors closed, allow the vehicle to stand for several minutes so that it can level. 2. Turn the air suspension (if equipped) control to OFF. 3. Measure the height of a reference point on the front and rear bumpers at the center of the vehicle. 121