GMC Yukon XL 2015 Owner's Manual page 383

10-84 Vehicle Care
To dolly tow a two-wheel-drive
vehicle or a four-wheel drive vehicle
with a single speed automatic
transfer case, the vehicle must be
towed with the rear wheels on the
dolly. See Rear Towing (Rear
Wheels Off the Ground) later in this
section.
Four-Wheel Drive Vehicles with a
Two Speed Automatic
Transfer Case
To dolly tow a four-wheel drive
vehicle from the front:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Drive the front wheels onto the
dolly.
3. Shift the transmission to
P (Park).
4. Set the parking brake.
Warning
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). You or others could
be injured. Set the parking brake
before shifting the transfer case
to N (Neutral).
5. Use a 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 Four-Wheel
Drive on page 9-36.
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.
Rear Towing (Rear Wheels Off
the Ground)