Take a look on this forum for the thread for Colorado/Canyon towing, its a good read at 19 pages.
Bottom line GM wants you to disconnect the negative cable to prevent damage to the electric power steering - as such you will have no power in the vehicle when towing.
You will either have to provide a separate power feed (I assume to your aux brake system) or have a portable battery pack to provide the power.
Just researching this for my 2016 Colorado.
P.S. There is no option of pulling fuse, the battery must be disconnected.
Retired Canadian Army WO (1972-2000)
2003 4005 DSDP 350 Cummins/Spartan chassis
Toad 2103 Ford Edge w/ Patriot Braking system/Blue Ox base plate/Ready Brake tow bar.