A Mobile Surveillance Unit (MSU) Is a Portable Security SystemA unit can be deployed temporarily to monitor a area needing security, rather than installing permanent cameras or hiring security patrols. Read More: Richland Police Pause License Plate Cameras for New Privacy LawWhy Are Mobile Surveillance Units Needed? If a parking lot, apartment complex, or business experiences a spike in thefts or vandalism, a mobile unit can be deployed within hours. Who Uses Mobile Surveillance Units and why Are They Beneficial? The security units are common anywhere temporary or flexible security is needed.