Subaru 2006 Baja Owner's Manual page 315

Driving tips
3. Insert the hitch pin into the hole on the hitch receiv-
er tube so that the pin passes through the ball mount.
8-22
UB8018BA
4. Insert the safety pin into the hitch pin securely.
5. Pull the ball mount to make sure it does not come
off the hitch receiver.
HS8012BA