Before purchase of my 2010 GMC Yukon Denali Hybrid, I consulted the FMCA guide, and the vehicle's manual, both of which say it is towable.
However when I tried it, the steering wheel locks. After much research by a dealer, he found #PIT3673F published April 14, 2011 that states "This PI was superseded to show that the column lock models CAN NOT be dingy towed. Please discard PIT3673E."..... "The owner's manual may not comprehend if the vehicle is equipped with a steering column lock,...."
After contacting Government Motors for a "fix," they essentially said #@$%&*!
I have successfully defeated the lock by opening the column, removing the steering wheel, etc., and removing the engagement portion of the mechanism. I will be happy to help anyone with the same problem: It can be done with hand tools, using proper precautions for the airbag.