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GMC 1998 Envoy Owner's Manual page 203

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Every vehicle is ready
for
some trailer towing. If yours
was built with trailering options, as many are, it's ready
for heavier trailers. But trailering is different than just
driving your vehicle by itself. Trailering means changes
in handling, durability and fuel economy. Successful,
safe trailering takes correct equipment, and it has to be
used properly.
That's the reason for this part. In
it
are many
time-tested, important trailering tips and safety rules.
Many of these are important for your safety and that of
your passengers. So please read this section carefully
before you pull a trailer.
If You Do Decide To Pull A Trailer
If you do, here are some important points:
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There are many different laws, including speed limit
restrictions, having to do with trailering. Make sure
your rig will be legal, not only where you live but
also where you'll be driving. A good source for this
information can be state or provincial police.
Consider using a sway control if your trailer will
weigh 2,000 lbs. (900 kg) or less. You should always
use a sway control if your trailer will weigh more
than 2,000
Ibs. (900 kg).
You
can
ask a hitch dealer
about sway controls.
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Don't tow a trailer at all during the first
500
miles
(800 km) your new vehicle is driven. Your engine,
axle or other parts could be damaged.
Then, during the first 500 miles (800 km) that you
tow a trailer, don't drive over 50 mph
(80
km/h) and
don't make starts at full throttle. This helps your
engine and other parts of your vehicle wear in at the
heavier loads.
You should use DRIVE (D) (or, as you need to, a
lower gear) when towing a trailer. Operating your
vehicle in DRIVE (D) when towing a trailer will
minimize heat buildup and extend the life of
your transmission.
Three important considerations have to
do
with weight:
the weight of the trailer,
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the weight of the trailer tongue
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and the weight on your vehicle's tires.
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