Abstract: A new and useful top chord, and a new and useful container wall construction incorporating the top chord. The top chord has a tubular chord section and a special stepped stem integral with the tubular chord section. The stem has a relatively thick proximal portion connected with the tubular chord section and a relatively thinner distal portion extending from the thick portion. The thick proximal portion and the thinner distal portion co-operate to define a rectangular step having a predetermined thickness. The thickness of the step is designed so that the side wall can be closely sandwiched between the post and the thinner portion of the stem and the thick portion of the stem extends above the side wall and into facing relation with a portion of the post which extends above the side wall. The stem is bolted to the post and to the side wall with the thick portion bolted directly to the post and the thinner portion bolted to the post with the side wall sandwiched therebetween.