GMC 1996 Sierra Owner's Manual page 224

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CAUTION:
To help avoid injury to you or others:
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Never let passengers ride in
a
vehicle that is
being towed.
Never tow faster than safe or posted speeds.
Never tow with damaged parts not
fully secured.
Never get under your vehicle after it has
been lifted by the tow truck.
Always use separate safety chains on each
side when towing a vehicle.
For pickups (except cab chassis models),
use T-hooks on front of vehicle, J-hooks
on rear.
For cab chassis models, use J-hooks on
front and rear of vehicle.
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CAUTION:
A vehicle can fall from a car carrier if it isn't
adequately secured. This can cause a collision,
serious personal injury and vehicle damage. The
vehicle should be tightly secured with chains or
steel cables before it is transported.
Don't use substitutes (ropes, leather straps,
canvas webbing, etc.) that can be cut by sharp
edges underneath the towed vehicle.
When your vehicle
is
being towed, have
the
ignition
key in the OFF position. The steering wheel should be
clamped in a straight-ahead position, with a clamping
device designed for towing service. Do not use the
vehicle's steering column lock for this. The transmission
and transfer case, if you have one, should be in
NEUTRAL (N) and the parking brake released.
Don't have your vehicle towed on the drive wheels
unless you must. If the vehicle must be towed on the
drive wheels, be sure to follow the speed and distance
restrictions later in this section or your transmission will
be damaged. If these limitations must be exceeded, then
the drive wheels have to be supported on a dolly.
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