An enclosure assembly configured to enhance accessibility to a drive unit of a vehicular agricultural applicator is provided. The enclosure assembly generally includes a housing, and a hinged panel pivotal about an axis defined by a hinge assembly between an open and a closed position with respect to the housing. The axis is generally aligned in a fore and aft direction. The enclosure assembly further includes an arm pivotally coupled at the hinged panel and movable between a stowed position and an extended position. In the folded position, the arm is retained in a slot at the hinged panel. In the extended position, the arm is in general vertical alignment engaged at the housing so as to hold the hinged panel in the open position.