Dodge 2007 LX Magnum Owner's Manual page 125

Rollaway Tonneau Cover — If Equipped
The removable rollaway tonneau cover mounts in the
cargo area behind the top of the rear seats.
The tonneau cover, when extended, covers the cargo area
to keep items out of sight. Notches in the trim panels near
the liftgate opening secure the extended tonneau cover in
place.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 125
The tonneau cover rolls away neatly inside its housing
when not in use. You can also remove the tonneau cover
from the vehicle to make more room in the cargo area.
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