1997 Ford F250 Owner's Manual - Page 210

Hitches Do not install a single or multi-clamp type bumper hitch, or a hitch which attaches to the axle. Underbody mounted hitches are acceptable if installed properly. Follow towing instructions of a reputable rental agency. Whenever a trailer hitch and hardware are removed, make sure all mounting holes in the underbody are properly sealed to prevent noxious gases or water from entering. Step bumper (If equipped) The optional step bumpers have a built-in hitch and only requires a ball with a one inch shank diameter. This step bumper has a Class III capability (5000 lb/2,270 kg trailer weight and 500 lb/680 kg tongue weight). Safety chains Always use safety chains between your vehicle and trailer. Cross chains under the trailer tongue and allow slack for turning corners. Connect safety chains to the vehicle frame or hook retainers. Never attach chains to the bumper. Trailer Brakes Separate trailer brakes are required on most towed vehicles weighing over 1,500 lb (680 kg). RWARNING 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. 210