Good concept and execution.
Tiking
There is a similar system with a Phalanx Close-In Weapon System (a high-rate-of-fire cannon for surface-to-air defense) and Rolling Airframe Missile Guided Weapon System (RAM), mounted on a HEMTT vehicle.
These were all concept vehicles and not purchased by the US military anyways.
The Phalanx system was mounted on a flatbed trailer and deployed to Iraq though, just not on a HEMTT.