Art Field and Alex W are mistaken
Your facts are not correct I am afraid. Having worked on both C130 and TriStar tankers I remember that the Herk has never been cleared behind the TriStar. It was tried with the C130K and the vibration as the fin came up behind the TriStar No2 engine was apparently something to behold and handle. It was discussed again when JATE wished to clear the J-model behind the TriStar in 98/99. Fortunately the ex-TTF C130 pilot that had done the original trials was then a TriStar captain and explained as the J fin was the same as the Ks to all intents and purposes it was a waste of time. Unfortunately the TriStar books still show the C130 as a cleared receiver - bit of a waste of time as the C130 books do not show it as cleared to receive from the TriStar.
FMT