Dodge 2008 Dakota Owner's Manual page 150

150 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
1 - Utility Rail Cleat
2 - Cleat Retainer Nut
3 - Utility Rail Detent
Utility Rail
To remove the cleats from the utility rail, remove the end
cap by pushing up on the locking tab, located on the
bottom of the end cap. Slide the cleat off the end of the
rail.
Utility Rail End Cap