Especially when doing modifications like wheels verses track layouts. The turret y x thingy has even more possibilities. I've made quite a few interesting configs like movable soldier body parts, and various other turret layouts. One I'm working on now is a land rover look-a-like with a gunner mounted on the top of the cab complete with rotating turret assembly.
(http://static1.filefront.com/images/personal/l/lppena/106799/eehlwjtqdl.thumb500.jpg)
The Rock Tank Odf appears to be more useful for twin based weapons like guns, cannons, and rockets. The Ass. Tank only appears to be able to fire a single weapon at a time by the AI, but does appear to move quite a bit more stable; the RT is quite a bit squirrelly overall compared to the AT. I wonder why this oddity is present? Do you suppose it's due to one being a support type verses assault? BNG.
The weapon use is due to the different AI used for each one. The RT and AT both have combat and assault HP's. The RT has a higher center of gravity than the AT and is faster and has more thrust, much like your LR. There's new settings for lowering the center of gravity.
Ai process, Thats this bit
aiName = "SupportProcess"
aiName2 = "SupportProcess"
fires assault weapons at assault targets and combat at combat.
One word of caution though...when adding a gunner figure don't attach it to the turret_x assembly. I found this out today when I loaded the model into the game with the gunner glued to the x part and he would go up and down with the turret; not a pretty site considering his seat was attached to the y turret. Although, his head could be attached to x if you want him to look up and down as the turret points up and down to fire. i did this with my version of a gun bike based off the RT odf.
(http://static1.filefront.com/images/personal/l/lppena/106799/zieghpkmbf.thumb500.jpg)
This unit also based off the RT odf has a gunner figure sitting on the y turret.