What are my chances of?

getting my BCT training location switched? I'm good to go in 17 days to begin BCT at Ft. Jackson but I have my eyes on switching BCT locations to either Benning or Knox. I know as a non-combat MOS most of us end up in Jackson but I truly believe that this course of action would make me into a better Soldier. The station commander told me that he would notify his commander and that on my last trip to MEPS before shipping out, they would let me know if there is any vacancies. What are the chances of getting your BCT location changed on the day of ship? Thanks in advance.