1994 GMC Suburban 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: I A vehicle can fall from a car carrier if it isn't adequately secured. This can causea collision, serious personal injury and vehicle damage.The vehicle shouldbe tightly secured with chains or steel cables before is transported. it Don't use substitutes (ropes, leather straps,canvas webbing, etc.) that can becut by sharp edges underneath the towed vehicle. 5-8