I'm pretty sure not all of them came with a steering column lock. I doubt you would want to tow it locked anyway. Front tires need to track around corners. Assuming you are towing behind a motorhome.
If it locks when your towing it. Front tires will not last long at all. Mine is a 97 and does not lock. Sure hope it does not when turned also. Be bad to have to leave my key in it. When were towing it behind the RV.