GMC 2012 Canyon Owner's Manual page 336

Two-wheel-drive vehicles should
not be towed with all four wheels on
the ground.
Two-wheel-drive transmissions have
no provisions for internal lubrication
while being towed.
Use the following procedure to
dinghy tow a four-wheel-drive
vehicle:
1. Position the vehicle being towed
behind the tow vehicle.
2. Put an automatic transmission in
P (Park) or a manual
transmission in 1 (First).
3. Turn the engine off and firmly set
the parking brake. See
.
4. Securely attach the vehicle
being towed to the tow vehicle.
Shifting a full time four wheel
drive vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the automatic
transmission is in P (Park) or the
manual transmission is in any
gear. You or others could be
injured. Make sure the parking
brake is firmly set before the
transfer case is shifted to
N (Neutral).
5. Shift the transfer case to
N (Neutral). See Shifting into
N (Neutral) under
.