Ford F-150 2000 Introduction Manual page 85

Flareside only:
Remove two cross bars from pickup box by pushing towards either
side to release tension.
Lower tailgate, depress the levers on each side of the rear rail and
remove rear rail from pickup box.
Styleside only:
Remove three cross bars from pickup box by pushing towards either
side to release tension. Stow the cross bars in the notches behind the
rolled cover in the pickup box.
Lower tailgate, depress the levers on each side of the rear rail and
push rear rail towards the front of the pickup box securing it behind
the cross bars and cover.
For installation of the cover, follow the removal procedure in reverse
order.
Make sure the crossbows are locked in the notches in the side rails and
the rear rails are locked in position prior to cover installation.
Controls and features
85