Cadillac 1998 Eldorado Owner's Manual page 250

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 front T-hook slots or
R-hooks inserted in the rear R-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 OFF. 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 transaxle 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 transaxle will be
damaged. If these limitations must be exceeded, then the
drive wheels have to be supported on a dolly.
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