Buick 2007 Rendezvous Owner's Manual page 349

Driving On Grades
Reduce speed and shift to a lower gear before
you start down a long or steep downgrade. If you
do not shift down, you might have to use your
brakes so much that they would get hot and
no longer work well.
If you are towing a trailer that weighs more than
1,000 lbs (450 kg), drive in AUTOMATIC
OVERDRIVE (D) or, as you need to, a lower gear.
This will minimize heat build-up and extend the
life of your transaxle.
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, do
the following:
1. Apply your regular brakes, but do not shift into
PARK (P) yet.
2. Have someone place chocks under the trailer
wheels.
3. When the wheel 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 then shift to PARK (P).
5. Release the regular brakes.
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