Yes the Colorado/Canyon pickups are narrower than a silverado/f150 so you will need strap-on mirrors if you want to see the trailer sides. But narrower also means easier to park in a parking lot along other cars.
I've been VERY HAPPILY towing my 30ft 7K TT with my 2015 3.6l gas Canyon since 2016 (16,000+ miles). With a properly setup WDH and TowHaul my rig passes up semi's and other full sized pickups going up hill. I can easily pull my 7K TT up a 7% grade doing 75 MPH in southern WVa, northern NH, and VT mountain interstate highways.
The secret is the factory installed TowHaul which lets the computer control the engine speed AND transmission gears for maximum power output. If TowHaul is NOT turned on, the truck will be a dog when pulling a 7K TT. (Could be what Bionic Man experienced.)
IMHO, your diesel version should not have any issues pulling a 27ft TT that has a GVWR below 7,700# AND you use TowHaul.