GMC 1994 Yukon Owner's Manual page 212

Whether you can move the shift lever for thc transmission and transfer
case, if you have one.
If there was an accident, what was damaged.
A
CAUTION:
When your vehicle is being towed, have the ignition key 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 t.his. The transmission and transfer case, if you have one,
should be in Neutral and the parking brake released.
A
CAUTION:
A vehicle can fall from a car carrier if it isn't adequately
I
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.
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