Rear oscillation paired with front vibration is featured in the HD12VO and HD14VO double-drum rollers. Drum width is 47 and 54 inches, respectively. The rollers have hydrostatic dual drum drive, automatic/manual vibration, and hydrostatic articulated steering. The engine is mounted lengthwise for visibility. Three-point articulation maintains even weight distribution across the drum width. The operator platform is fully insulated against vibration, and the operator's seat, steering column and tread plate are mechanically isolated from the framework.