Tail / Driveshaft Angle..???

I allmost forgot to ask the simplest of questions. Are you having the vibrations moving or standing still? Assuming it's moving, is there any speed it is more pronounced? Or Condition ... Accelerating, Maintaining speed, or Coasting? If it's standing still by chance, then it can only be the Engine/ Verter Balance as those would be the only things spinning.

Eric