GMC 1996 Sonoma Owner's Manual page 194

A
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. Always use
T-hooks inserted in the
T-hook
slots. Never use
J-hooks. They will damage drivetrain and
suspension components.
When your vehicle is being towed, have the ignition key
turned to 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
should be in NEUTRAL (N) and the transfer case, if
you have one, should be in 2HI. The parking brake
should be released.
Don't have your vehicle towed on the drive wheels
unless yo11 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.