An agricultural implement system includes a tow bar configured to couple to a hitch assembly. The agricultural implement system also includes a first wing tool bar rotatable relative to the tow bar and disposed proximate to a first side of the tow bar. The first wing tool bar has a first send proximate to the first side of the tow bar and a second end opposite the first end. Further, the agricultural implement system includes a caster wheel assembly having a caster wheel pivotally coupled to a sub-frame. The first sub-frame is pivotally coupled to the first wing tool bar proximate to the second end of the first wing tool bar, and is coupled to the first wing tool bar such that the axis of rotation of the sub-frame extends through the first wing tool bar.