http://www.gmfleetorderguide.com/NASApp/domesti…

Highlights:

Track package cannot be ordered with the Luxury package.
All the safety crap is bundled into one package, but you have to order that package if you want the security package (or rain sensing wipers)
Some of the stuff deleted with the track package can be optioned back in.
The performance data recorder can be ordered independently of the track package.
Nothing is transmission dependent (save remote start)