An attachment arm assembly includes an attachment arm that is pivotal about an arm pivot axis using a hydraulic lift cylinder. The attachment arm assembly also includes an interface plate pivotal about an interface plate pivot axis and configured to mount a tool. The interface plate has a main body and includes a first side edge having a first end and a second end. The interface plate includes a second side edge having a first end and a second end. The interface plate also includes a top edge that couples the second end of the first side edge to the second end of the second side edge. The first ends of the first and second side edge are spaced apart from each other a distance greater than a distance between the second ends of the first and second side edges.