2003 Subaru Forester Owner's Manual - Page 297

Driving tips back of trailer's axle than in the front, the load is taken off the rear axle of the towing vehicle. This may cause the rear wheels to skid, especially during braking or when vehicle speed is reduced during cornering, resulting in oversteer, spin out and/or jackknifing. ! Trailer hitches Choose a proper hitch for your vehicle and trailer. The use of a genuine SUBARU trailer hitch is recommended. A genuine SUBARU hitch is available from your SUBARU dealer. If use of a non-genuine hitch is unavoidable, be sure the hitch is suited to your vehicle and trailer. Consult with a professional hitch supplier to assist you in choosing an appropriate hitch for your vehicle. Be sure to follow all of the hitch manufacturer's instructions for installation and use. Never use a hitch that mounts only to the rear bumper. The bumper is not designed to handle that type of load. For all types of hitches, regularly check that the hitch mounting bolts and nuts are tight. Never drill the frame or under-body of your vehicle to install a commercial trailer hitch. If you do, dangerous exhaust gas, water or mud may enter the passenger compartment through the drilled hole. Exhaust gas contains carbon monoxide, a colorless and odorless gas which is dangerous, or even lethal, if inhaled. Also, drilling the frame or under-body of your vehicle could cause deterioration of strength of your vehicle and cause corrosion around the drilled hole. " Do not modify the vehicle exhaust system, brake system, or other systems when installing a hitch or other trailer towing equipment. " Do not use axle-mounted hitches as they can cause damage to the axle housing, wheel bearings, wheels or tires. 8-30