A rail assembly can include a track assembly, an elongate shaft mounted to the track assembly, and a carriage assembly received within the track assembly. The carriage assembly can include a slider bracket. The slider bracket includes a first ramp portion and a second ramp portion. The first and second ramp portions are disposed on opposite sides of the slider bracket. The first and second ramp portions each define a receiving aperture. The elongate shaft is received through the receiving apertures of the first and second ramp portions.