Abstract: A combination apparatus comprises a truck bed sidewall providing a horizontally oriented top bed wall portion and an integral downwardly extending inner, outer end portions, and a sidewall cover providing a horizontally oriented top cover portion and integral therewith and extending downwardly therefrom, an inner, outer and end cover portions dimensionally sized to fit over the truck sidewall with the corresponding top, side and end portions in surface to surface contact. The sidewall cover comprises plural sections arranged in linear mutually abutting sequence defining at least one section interface between sections. The interface comprises a pair of complementary mutually interengagable U-shaped edges wherein a first one of the U-shaped edges provides an extending lip and a second one of the U-shaped edges provides a recessed lip, the recessed lip receiving the extending lip in overlapping abutment.