Side rail of a flatbed trailer for use with cargo restraint devices

A floor assembly of a vehicle, for example, comprising:

• a plurality of transversely-extending cross members;
• a plurality of longitudinally-extending floor planks positioned above and coupled to a top surface of the plurality of cross members;
• and
• a support member configured to extend generally along a length of the floor assembly, the support member including a top wall generally flush with the plurality of longitudinally-extending floor planks, and a vertical wall coupled to the top wall and extending downwardly therefrom such that a bottom end of the vertical wall is positioned generally below the cross members,
• wherein the support member is positioned between two of the longitudinally-extending floor planks, and
• wherein the top wall of the support member includes a channel formed therein which extends along a length of the support member, the channel being configured to receive a cargo restraint device therein.