Cadillac 2011 DTS Owner's Manual page 302

This feature keeps the rear of your vehicle level
as the load changes. It is automatic, you do not
need to adjust anything.
This type of level control is fully automatic and will
provide a better leveled riding position as well as
better handling under a variety of passenger and
loading conditions. An air compressor connected
to the rear shocks will raise or lower the rear of
the vehicle to maintain proper vehicle height. The
system is activated when the ignition key is turned
to ON/RUN and will automatically adjust vehicle
height thereafter. The system may exhaust (lower
vehicle height) for up to ten minutes after the
ignition key has been turned to LOCK/OFF. You
may hear the air compressor operating when the
height is being adjusted.
5-24
Consult your dealer or a professional towing service if
the disabled vehicle must be towed. See Roadside
Service on page 8 7.
To tow the vehicle behind another vehicle for
recreational purposes (such as behind a motorhome),
see Recreational Vehicle Towing following.
Recreational vehicle towing means towing the vehicle
behind another vehicle
The two most common types of recreational vehicle
towing are known as dinghy towing and dolly towing.
Dinghy towing is towing the vehicle with all four wheels
on the ground. Dolly towing is towing the vehicle with
two wheels on the ground and two wheels up on a
device known as a dolly.
such as behind a motorhome.