mhscspo,

You got it working for Vista 64 ?  If so what do you think was the problem (or mistake) and solution ?

For 'Wheels': so long as you type in the exact unique name of either the front or rear wheels and get the diameter correct then the wheels will spin when the vehicle ( which the modifier is applied to) is moved. 

If the Brake Lock or Disable Completely are checked (be careful with key frames) then the wheels wont spin.  An easy user mistake is to get the wheel names wrong.  I will be releasing an update for most of my plugins (in a few weeks) that adds selection dialogs to all of the C5/C6 versions.

There is a section in the manual that explains what each of the user interface options is for.

Follow the instructions for the Humvee to the letter.  If the facing axis and wheel overide axes arent correct then the constraints on the body parts will stop them from spinning.

Also an issue has come up with 'Wheels' that if anything in the scene uses a Carrara 'Spin' modifier then it kills my plugin.