Thanks for your concern.
I bought a 2011 Chevy Cruze LT and lost the transmission the first time out. The transmission was replaced and we made it back to the house after about 2500 miles with no problem. When we got back to the house a letter was there from GM notifying me that the Cruze was not flat towable. No more towing!
GM next traded me a 2012 Malibu LT even. I had just gotten the base plate installed when I noticed the same addendum that was sent to me for the Cruze. I called my dealer and told him that I had found a notice that the Malibu could not be flat towed. After a period of silence, he said he would call back. He called later and said that they were looking into trading me an Equinox for the Malibu. They had also found the addendum in all of their Malibu manuals.
The next day I was called back and told that after consulting GM in Detroit, the addendum in the Malibu manual was not correct and the Malibu could be flat towed and GM would send me a letter verifying all of this. I now have the letter and consider that the Malibu can be flat towed. The how-to instructions are in the manual.
As far as I am concerned, the warranty along with the letter is all that I need.
Why the Malibu can be flat towed and the Cruze can not is a mystery to me. Both have a 6 speed transmission and a 4 cylinder engine.
Other than a lot of work by me removing and installing stuff, GM and Starling Chevrolet has been very good about the whole issue.