ahhh , thats how you did it Bodrick, i was watching your stunts video and i just wandered how you did it. thanks
You can also use cam_idealdist; cam_idealyaw; and cam_idealpitch to change camera distance and angle.
There's also Gmod menus that have a 3rd person GUI, where you can adjust everything easily. Just use Gmod, that, and load up a map (and assuming you have a menu with the Empires models) load up a jeep and drive around. That's how I would do it...