Subaru Forester: Connecting a trailer / 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 Federal, state/province and/
or other applicable regulations.
CAUTION
Direct splicing or other improper
connection of trailer lights may
damage your vehicle’s electrical
system and cause a malfunction of
your vehicle’s lighting system...
Other information:
When backing up the vehicle, the front
passenger’s side outside mirrors will turn
downward automatically to provide better
rear visibility.
Push the ignition switch to the ON
position.
Move the select lever to the R (Reverse)
position.
The outside mirror angle moves downward...
If your trailer is equipped with its own braking system, verify that it complies with all applicable state or local regulations and that it has been installed correctly and is operating properly before towing.
If the trailer exceeds the maximum allowable trailer weight for towing without trailer brakes, it must be equipped with an adequate braking system...