Pontiac 2003 Aztek Owner's Manual page 292

Trailer Brakes
If your trailer weighs more than 1,000 Ibs. (450 kg)
loaded, then it needs its own brakes -
and they must be
adequate. Be sure to read and follow the instructions
for the trailer brakes so you'll be able to install,
adjust and maintain them properly.
Because your vehicle may have anti-lock brakes, do not
try to tap into your vehicle's brake system. If you do,
both brake systems won't work well, or at
all.
Driving with a Trailer
If you have a rear-most window open and you
pull a trailer with your vehicle, carbon
monoxide (CO) could come into your vehicle.
You can't see or smell CO.
It
can cause
unconsciousness or death. See "Engine
Exhaust" in the Index. l o maximize your saieiy
when towing a trailer:
0
Have your exhaust system inspected for
leaks, and make necessary repairs before
starting on your trip.
CAUTION: (€ontinueuj
0
Keep the rear-most windows closed.
0
If exhaust does come into your vehicle
through a window in the rear or another
opening, drive with your front, main
heating or cooling system on and with the
fan on any speed. This will bring fresh,
outside air into your vehicle. Do not use
the comfort control setting for maximum
air because it only recirculates the air
inside your vehicle. See "Comfort
Controls"
in
the Index.
Towing a trailer requires a certain amount of experience.
Before setting out for the open road, you'll want to get
to know your rig. Acquaint yourself with the feel of
handling and braking with the added weight of the trailer.
And always keep in mind that the vehicle you are
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not
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