Subaru Legacy BN/BS (2015-2019) Owners Manual: 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. Two chains should be used in total, one to the right side and the other to the left side trailer tongue. 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.