Subaru 2001 Forester Owner's Manual page 137

Starting and operating
n Parking on a grade
Always block the wheels under both vehicle and trailer when parking.
Apply the parking brake firmly. You should not park on a hill or slope.
But if parking on a hill or slope cannot be avoided, you should take
the following steps:
1. Apply the brakes and hold the pedal down.
2. Have someone place wheel blocks under both the vehicle and
trailer wheels.
3. When the wheel blocks are in place, release the regular brakes
slowly until the blocks absorb the load.
4. Apply the regular brakes and then apply the parking brake; slowly
release the regular brakes.
5. Shift into 1st or reverse gear (manual transmission) or "P" (auto-
matic transmission) and shut off the engine.
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