Thin section sidewall assemblies for vans and trailers

A sidewall assembly for a transporting vehicle comprises at least one outer flat side sheet (8) having an inner wall extending along a longitudinal axis, and a plurality of vertical side posts (4) affixed to said at least one outer side sheet in spaced relationship along said inner wall. The said side posts have a flat inner wall lying in spaced relationship to said inner wall of said at least one side sheet, and a pair of bent edge segments lying on opposite vertical sides of said flat inner wall, said bent edge segment projecting from said flat inner wall toward said at least one side sheet and having a free end to form a space between said free end and said at least one side sheet. A plurality of liners (6) respectively extend between adjacent side posts, said liners having a flat central portion forming a generally flat interior face, and vertical side portions extending on opposite vertical sides of said central portion respectively for extending into said space in contact with said bent edge portions of said side posts.