A vehicle running board assembly includes, among other things, a reinforcing insert, and a beam that is extruded over the reinforcing insert. A step pad is extruded over the beam. A vehicle running board manufacturing method according to another exemplary aspect of the present disclosure includes, among other things, extruding a beam over a reinforcing insert, extruding a step pad over the beam, and cutting the beam, the reinforcing insert, and the step pad to provide the running board.