In the evening they move the support stations to the pits? Can you leave easily from there?
Ken,
You can pretty much come and go from the night pits at will. There is a small overpass that you can drive on.
I think the only time that it may be "closed" or "controlled", would be the time when all the 12 and 24 hour riders are transitioning from the 11 mile day loop onto the track, as they also ride on this overpass. Other than that, once all the riders are on the track, then you should be able to come and go as you please.
During the day loop many cars come and go down the straight where all the support teams are setup.
It is a bit hectic as a rider having to navigate all the cars.
To alleviate this issue, I would set up closer to the start gate, as then there is left traffic to have to drive through.
Some people also just stay parked at the hotel - which is just next door - and then walk from the support area to their car if they need to leave for any reason. Lots of options - and people usually "claim" their support locations the night before and park their cars there.
It should not be hard for all the Cruzbike support teams to co-locate, so some of the support have company and help each other out.
Hope this helps.