No they dont. They all come with the G80 locker, but the tow package is optional. Thats how I got mine as I needed a different tow hitch than the one GM was using.....saved about $300 doing it on my own with an aftermarket hitch and wiring kit. Took about an hour to install.All Z71s have the tow package and G80.
All diesel equipped Colorado/Canyons come with the tow package and G80.