Chevrolet 2008 Silverado 1500 Pickup Owner's Manual page 175

To adjust a tie-down, pull the locator pin out and
move the tie-down to another location making sure
the locator pin lines up with a locator hole on the rail.
The tie-down pin may not be installed correctly if the pin
does not line up, turn it over and reinstall. The tie-down
will not move when the pin is installed completely.
The maximum load for each rail is 500 lbs (227 kg).
The rails are notched at each end which allows the
tie-downs to be removed and placed on another
rail. To remove, pull the locator pin out and slide the
tie-down to the end of the rail and pull back.
To remove or install cargo tie-downs at the front of the
bed, slide the corner cap towards the center of the
bed to expose the rail notches. To remove the corner
cap, pull either edge away from the rail.
To remove the system, loosen the toggle bolts on each
rail until they can be removed from the bed of the
truck. To replace the system, place the toggle bolts and
rails into their original locations and tighten them to a
torque setting of 12.5 ft-lbs (17 Y).
If the system is removed to install a bed liner, make
sure there is no bed liner material in the installation
points.
Notice: If you tie down cargo using the horizontal
slots on the top of the pickup box, you may damage
the box. Using the horizontal slots on the top of the
pickup box for tie-down locations may cause damage
to the pickup box and would not be covered by your
warranty. Only use the tie-down loops if you do not
have the cargo management system.
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