A combination of a rail, an upright, and a slide connector for attaching the rail to the upright includes a first connector part including a mounting arm secured to an underside surface of the rail adjacent one end thereof and a tongue depending generally downwardly from the mounting arm, and a second connector part including a mounting base secured to a side surface of the upright and a generally planar engagement body extending laterally outwardly from the mounting base. The engagement body has a slot therein for receiving the tongue when the rail is translated along an engagement axis from a disengaged position in which the first and second parts are generally free to move relative to each other to an engaged position in which the first and second parts are substantially inhibited from moving relative to each other, thereby attaching the rail to the upright.