Subaru 2003 Legacy - Manual (Page 324)

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4. Pull the ball mount to make sure it does not come off the hitch re-
ceiver.
HB8020AA
5. Use only a hitch ball that is appropriate for the ball mount and your
trailer. The hitch ball must be securely installed on the ball mount.
6. Connect your trailer to the hitch ball.
7. Connect the trailer and the hitch with safety chains that will hold
the trailer’s maximum gross weight. The chains should cross under
the trailer tongue to prevent the tongue from dropping onto the
ground in case it should disconnect from the hitch ball. Allow suffi-
cient slack in the chains taking tight–turn situations into account; how-
ever, be careful not to let them drag on the ground.
HB8022BB HB8020BB