Pontiac Vibe 2007 Owner's Manual page 267

Driving On Grades
Reduce speed and shift to a lower gear before
you start down a long or steep downgrade. If you
don't shift down, you might have to use your
brakes so much that they would get hot and no
longer work well.
On a long uphill grade, shift down and reduce
your speed to around 45 mph (70 km/h) to reduce
the possibility of the engine and the transaxle
overheating.
Parking on Hills
CAUTION:
{
You really should not park your vehicle,
with a trailer attached, on a hill. If
something goes wrong, your rig could
start to move. People can be injured, and
both your vehicle and the trailer can be
damaged.
But if you ever have to park your rig on a hill,
here's how to do it:
1. Apply your regular brakes, but don't shift into
PARK (P) for an automatic transaxle or into
gear for a manual transaxle, yet. When
parking uphill, turn your wheels away from the
curb. When parking downhill, turn your
wheels into the curb.
2. Have someone place chocks under the trailer
wheels.
3. When the chocks are in place, release the
regular brakes until the chocks absorb the load.
4. Reapply the regular brakes. Then apply your
parking brake and shift into PARK (P) for an
automatic transaxle or REVERSE (R) for
a manual transaxle.
5. Release the regular brakes.
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