Abstract: A kit for lining the inside of the bed of a pickup truck is made of plywood liner sections, including side panel liner sheets that are outwardly bowed and captured between the truck bed floor and an inwardly extending shoulder of the upper rail of the side panel. The side panel liner sheets are held in outwardly bowed position to more closely conform to the outward curvature of the truck side panels by wheel well liner boxes that cover the wheel wells. The boxes are forced outwardly against intermediate sections of the side panel liner sheets and fixed to the wheel wells. Tail box liner sections, also of plywood, cover the truck body tail light boxes, are fixed to the tail light boxes, and hold the rear edges of the side panel liner sheets in position.