Abstract: A side rail can define an exterior channel. A coupling strip can be slidably retained within the exterior channel of the side rail and can be positioned to selectively engage with a coupling strip of a tonneau cover. An end cap can be positioned on an end of the side rail. The end cap can include an exterior tab extension received within the exterior channel, and the exterior tab extension can have an end face positioned within the exterior channel and spaced from a corresponding end of the exterior channel. The end face of the exterior tab extension can be positioned to engage an opposing end face of the coupling strip within the exterior channel to positively limit longitudinal sliding movement of the coupling strip within the exterior channel.

Abstract: A side rail can define an exterior channel. A coupling strip can be slidably retained within the exterior channel of the side rail and can be positioned to selectively engage with a coupling strip of the tonneau cover. An end cap can be positioned on an end of the side rail. The end cap can include an exterior tab extension received within the exterior channel, and the exterior tab extension can have an end face positioned within the exterior channel and spaced from a corresponding end of the exterior channel. The end face of the exterior tab extension can be positioned to engage an opposing end face of the second coupling strip within the exterior channel to positively limit longitudinal sliding movement of the second coupling strip within the exterior channel.

Abstract: A side rail can define an exterior and an interior channel. A coupling strip within the exterior channel of the side rail can be positioned to selectively engage with a coupling strip of a tonneau cover. An end cap can be positioned on an end of the side rail. The end cap having an end face can include an interior extension within the interior channel and an exterior tab extension within the exterior channel between the longitudinal raised side portions. A retaining fastener can extend through the exterior tab extension and can fix the end cap to the side rail without the retaining fastener passing through the coupling strip. The exterior tab extension can limit longitudinal sliding movement of the coupling strip within the exterior channel.

Abstract: A side rail can define an exterior and an interior channel. A coupling strip within the exterior channel of the side rail can be positioned to selectively engage with a coupling strip of the tonneau cover. An end cap can be positioned on an end of the side rail. The end cap having an end face can include an interior extension within the interior channel and an exterior tab extension within the exterior channel between the longitudinal raised side portions. A retaining fastener can extend through the exterior tab extension and can fix the end cap to the side rail without the retaining fastener passing through the second coupling strip. The exterior tab extension can limit longitudinal sliding movement of the second coupling strip within the exterior channel.

Abstract: A pair of tension adjustment blocks can include one or more positioning members receivable in the tension adjustment block mounting aperture to define a selected one of a plurality of distances from the aperture to a corresponding end of the tension adjustment block. When the tension adjustment blocks are selectively arranged in one of a plurality of orientations with one of the positioning members inserted into the tension adjustment block mounting aperture of each of the side rails to define a selected distance, the corresponding end of each tension adjustment block retains a header at a selected fore/aft position related to the selected distance that is different from the other adjustment tension adjustment block orientations and related distances.

Abstract: A pair of tension adjustment blocks can include one or more positioning members receivable in the tension adjustment block mounting aperture to define a selected one of a plurality of distances from the aperture to a corresponding end of the tension adjustment block. When the tension adjustment blocks are selectively arranged in one of a plurality of orientations with one of the positioning members inserted into the tension adjustment block mounting aperture of each of the side rails to define a selected distance, the corresponding end of each tension adjustment block retains a header at a selected fore/aft position related to the selected distance that is different from the other adjustment tension adjustment block orientations and related distances.