Overhead truss assemblies for use with retail displays are provided. The assemblies include multiple trusses that are parallel to and spaced from each other, spanning overhead or otherwise elevated and connecting merchandise display racks on opposing sides of an aisle or aligned with and atop a single merchandise display rack. The trusses have horizontal truss segments and define variable mounting widths. The variable mounting widths are established with one or more connector assemblies that cooperate with and move longitudinally along the horizontal truss segments. Each connector assembly includes a captured plate that is slidingly housed inside of the horizontal truss segment, and an insert connected to and moving in unison with the captured plate. Moving the connector assembly inwardly toward a middle portion of the truss defines a relatively narrower mounting width, while moving the connector assembly outwardly toward an end of the truss defines a relatively wider mounting width.