GMC Yukon XL Denali Owner's Manual page 402

10-86 Vehicle Care
Here are some important things to
consider before recreational vehicle
towing:
What is the towing capacity of
the towing vehicle? Be sure to
read the tow vehicle
manufacturer's
recommendations.
What is the distance that will be
travelled? Some vehicles have
restrictions on how far and how
long they can tow.
Is the proper towing equipment
going to be used? See your
dealer or trailering professional
for additional advice and
equipment recommendations.
Is the vehicle ready to be
towed? Just as preparing the
vehicle for a long trip, make sure
the vehicle is prepared to be
towed.
All-Wheel-Drive Vehicles
Dinghy and Dolly Towing
Notice: Towing an all-wheel-drive
vehicle with all four wheels on the
ground, or even with only two of
its wheels on the ground, will
damage drivetrain components.
Do not tow an all-wheel-drive
vehicle with any of its wheels on
the ground.
All-wheel-drive vehicles are not
designed to be towed with any
wheels on the ground. If the vehicle
must be towed, see Towing Your
Vehicle previously.