A mobile vacuum system includes a mobile support frame, a vacuum source connected to selectively vacuum materials into a primary collection tank and a secondary collection tank. The primary collection tank is mounted on the frame, while the secondary collection tank is connected to either the frame of the primary collection tank by a boom. The boom, which can be in the form of an articulated arm, allows the secondary collection tank to be moved through a wide range of motion relative to the frame, e.g., for dumping debris from the secondary tank.