Cadillac 2011 DTS Owner's Manual page 295

The vehicle was not designed to be towed with all four
wheels on the ground. Use a dolly if the vehicle must be
towed. See Dolly Towing later in this section for more
information.
The vehicle can be towed using a dolly. To tow the
vehicle using a dolly, follow these steps:
1. Put the front wheels on a dolly.
2. Put the gear shift lever in P (Park).
3. Set the parking brake.
4. Clamp the steering wheel in a straight-ahead
position with a clamping device designed for
towing.
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