Buick LaCrosse Owner's Manual page 439

3. Shift the transmission to
P (Park).
4. Firmly set the parking brake.
5. Use an adequate clamping
device designed for towing to
ensure that the front wheels are
locked into the straight-ahead
position.
6. Secure the vehicle to the dolly
following the manufacturer's
instructions.
7. Release the parking brake only
after the vehicle being towed is
firmly attached to the towing
vehicle.
8. Turn the ignition to LOCK/OFF.
Vehicles with all-wheel drive cannot
be dolly towed.
The vehicle cannot be dolly towed
from the rear.