2010 Ford Expedition EL Owner Guide 1st Printing (Spanish) - Page 754

Tires, Wheels and Loading Weight distributing 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 in the ON position and all doors closed, allow the vehicle to stand (without passengers) 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. 4. Attach the trailer to the vehicle and adjust the hitch equalizers so that the front bumper height is within a 1⁄2" (13 mm) of the reference point. After proper adjustment, the rear bumper should be no higher than in Step 3. 5. Turn the air suspension (if equipped) control to on. WARNING: Do not adjust a weight distributing hitch to any position where the rear bumper of the vehicle is higher than it was before attaching the trailer. Doing so will defeat the function of the weight distributing hitch, which may cause unpredictable handling, and could result in serious personal injury. Safety chains Always connect the trailer's safety chains to the frame or hook retainers of the vehicle hitch. To connect the trailer's safety chains, cross the chains under the trailer tongue and allow slack for turning corners. If you use a rental trailer, follow the instructions that the rental agency gives to you. Do not attach safety chains to the bumper. Trailer brakes Electric brakes and manual, automatic or surge-type trailer brakes are safe if installed properly and adjusted to the manufacturer's specifications. The trailer brakes must meet local and Federal regulations. WARNING: Do not connect a trailer's hydraulic brake system directly to your vehicle's brake system. Your vehicle may not have enough braking power and your chances of having a collision greatly increase. 280 2010 Expedition (exd) Owners Guide (own2002), 1st Printing USA (fus)