Jeep 2008 Commander - Manual (Page 178)

If not equipped, your authorized dealer can order and
install Mopar
௡ cross rails built specifically for this roof
rack system or a number of after market rails that are
tailored to your life-style or activities.
The optional cross rails have five specific locations iden-
tified by a feature on both the side rail and the cross rail.
Cross rails must be secured in one of the five detent
locations on the side rail to prevent movement with a
sudden stop. The cross rails must also be installed using
the correct orientation (the longer rail toward the front)
with the wind trip toward the front of the vehicle as
shown below. For improved windnoise performance
when cross rails are not in use, place them in detent
positions #1 (first detent from the front of the vehicle) and
#4 (second detent from the rear of the vehicle) as indi-
cated with a unique feature on the side rails. The grab
handles (A) on the back of the vehicle (if equipped) are
not to be used as a towing feature.
NOTE: If the rear cross rail (or any metallic object) is
placed over the satellite radio antenna (if equipped), you
may experience interruption of satellite radio reception.
For improved satellite radio reception, place the rear
cross rail in detent position #4 when not in use.
Cross Rail Positions
178 UNDERSTANDING THE FEATURES OF YOUR VEHICLE