Things like the Tank Turret are actually player types, not vehicles.
You need to make a model with animations as .dsq files rather than embedded in the .dts. At least "root" (still pose) and "look" (how the turret changes when you look up and down, I'm not sure of the specific frames needed) are necessary otherwise the game will crash, other animations like firing can also be added. (you need them to "blend" or some similar option with that look animation)