2015 Chevy Colorado/GMC Canyon towable
The April 2014 Motorhome Dinghy Towing guide shows that the 2015 Chevy Colorado & GMC Canyon with automatic trans will be towable 4 down. It does say only 4WD models with two-speed automatic transfer case are towable. There is a sidebar that says this comes from info recently released by GM on its 2015 models. It didn't say anything about the release date.