From the manufacturer's point of view, why take chances? Recreational towing puts a lot of additional wear and tear on vehicles that does not register on the odometer. Who is to say the vehicle owner took all the necessary precautions (putting the transfer case in neutral, then shifting to park on a GM 4x4. I am sure other vehicles have different procedures) before yanking the towed vehicle down the road. It's a yearly occurance that someone attempts to drive off with the wheels on the towed locked up for one reason or another. That has to be hard on the internal parts. I am also sure that the front end doesn't appreciate the wheels being locked to the left and the rig being towed forward (also a yearly occurrence). Recreational towed vehicles is just too small a market for a manufacturer to be overly concerned with serving. I am actually surprised any manufacturer specifically allows it.
