I'm with Panther not FedEx but their system sounds tempting where related to board positions. I know it's more location that matters most times but when you don't know all the spots position sure helps.
I don't know how vans are dispatched at FedEx, although I assume it would be the same as it is for us straight trucks (we are in a White Glove, "D" straight for FedEx). As far as I know, we have no access to what our actual "position" is on an express center board. (If this is incorrect, please let me know)
We can call in (to the computer) and find out how many trucks our size ("D") and 1 size larger ("E") are checked into our express center. This would exclude "B" (vans) and "C" (smaller straights), so I am not convinced of its usefulness. The most trucks we have ever had in front of us when we have called in was recently in North Carolina, where there were 6. We got a load within an hour of calling in.
Since August (when we started), we have seldom had to wait, as we are usually pre-dispatched, and simply move onto our next load. I am sure every carrier does things differently. Maybe knowing our actual position on a board would help.