2003 Subaru Impreza Owner's Manual - Page 294

Driving tips WARNING D Adequate size trailer brakes are required when the trailer and its cargo exceed 1,000 lbs (453 kg) total weight. D Do not directly connect your trailer's hydraulic brake system to the hydraulic brake system in your vehicle. Direct connection would cause the vehicle's brake performance to deteriorate and could lead to an accident. B Trailer safety chains In case the trailer hitch connector or hitch ball should break or become disconnected, the trailer could get loose and create a traffic safety hazard. For safety, always connect the towing vehicle and trailer with trailer safety chains. Pass the chains crossing each other under the trailer tongue to prevent the trailer from dropping onto the ground in case the trailer tongue should disconnect from the hitch ball. Allow sufficient slack in the chains taking tight-turn situations into account; however, be careful not to let them drag on the ground. For more information about the safety chain connection, refer to the instructions for your hitch and trailer. WARNING Always use safety chains between your vehicle and the trailer. Towing a trailer without safety chains could create a traffic safety hazard if the trailer separates from the hitch due to coupling damage or hitch ball damage. B Side mirrors After hitching a trailer to your vehicle, check that the standard side mirrors provide a good rearward field of view without significant blind spots. If significant blind spots occur with the vehicle's standard side mirrors, use towing mirrors that conform with Fed- 8-34