Dodge Dakota 2008 Owner's Manual page 160

Utility Rail
1 - Utility Rail Cleat
2 - Cleat Retainer Nut
3 - Utility Rail Detent
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 159
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
3