Cadillac 2012 CTS-V Owner's Manual page 436

The vehicle was not designed to be
towed with all four wheels on the
ground. If a rear-wheel-drive vehicle
must be towed, a dolly or a trailer
should be used. If an all-wheel-drive
vehicle must be towed, a trailer
should be used. See Dolly Towing
following for more information.
Use the following procedure to dolly
tow a rear-wheel-drive vehicle from
the rear:
1. Attach the dolly to the tow
vehicle following the dolly
manufacturer's instructions.
2. Put the rear wheels on the dolly.