GMC 2014 Yukon/Yukon XL Owner's Manual page 422

2. Drive the front wheels onto the
dolly.
3. Shift the transmission to
P (Park).
4. Firmly set the parking brake.
Shifting a four-wheel-drive
vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). The driver or others
could be injured. Make sure the
parking brake is firmly set before
the transfer case is shifted to
N (Neutral).
5. Use an adequate clamping
device designed for towing to
ensure that the front wheels are
locked into the straight position.
6. Shift the transfer case to
N (Neutral). See
.
7. Secure the vehicle to the dolly
following the manufacturer's
instructions.
8. Release the parking brake only
after the vehicle being towed is
firmly attached to the towing
vehicle.
9. Turn the ignition to LOCK/OFF.
After towing, see Shifting Out of
N (Neutral) under
or
or
Use the following procedure to dolly
tow the vehicle from the rear:
.
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Drive the rear wheels onto the
dolly.