a plastic pickup truck box fabricated from a plurality of separately molded sections , wherein each section is molded of a plastic material , and the molded sections are joined together with an adhesive , has advantages over conventional metal pickup truck boxes and plastic pickup truck boxes molded as a single piece . advantages over metal pickup truck boxes include lighter weight , improved corrosion resistance , and improved impact resistance . advantages over conventional one - piece plastic pickup truck boxes include lower production costs , lower shipping costs , and improved mechanical properties and durability .