Wow, moving vehicle targets have always been iffy with RPAs due to the COMM infrastructure and glass on a vehicle which can cause refraction/reflection issues with laser targeting. Doesn't look like it anymore.
http://www.military.com/video/operations-and-strategy/air-strikes/mq-9-fires-dual-mode-brimstone-missile/3538472564001/
http://www.military.com/video/operations-and-strategy/air-strikes/mq-9-fires-dual-mode-brimstone-missile/3538472564001/