Depends if you make it a vehicle or not...
An example: You could make it an "accessory" image and mount to slot two when you collide with something, and add very very slow movement speed by changing the datablock, and have it give you an uber gun when you become a "turret." I've already started working on a version of this method, I just don't have models and am using it as a slash command. Also, if you want it to spawn from a vehicle pad, you could change its class (I think).