Not that I know of. The vehicles in the game are nothing but "scenery" graphics anyway. Can't really be compared with how vehicles worked in Tactics.
If the vehicle doesn't need to drive, then I'd do it this way:
1. Setup the tank body as normal vehicle (fixed graphic, cannot drive).
2. Setup the tank turret as critter.
3. Whenever the body is spawned, spawn the turret at hex position x.
That should give a more or less good effect. Not sure if it's very practical, though.