Okay, it was EXTREMELY tight but I got them in there with a CA in the middle and a Scenera on the side and then the other side. There is so little room front to back that neither seat was able to be reclined to have the line level to the ground but the Scenera was closer than the CA. I think you will definitely need an AA for the RN. The RN might also help more than the CA because it is lower profile and won't bump the Scenera where the CA does. I would not want to have to install Scenera/CA/Scenera on a regular basis. It also will be really hard to load from the side. Although I do not have captains chairs, just the 2 person bench in the second row so I don't know how that changes things.
Oh and if the seat belts don't lock by pulling them all the way out (my mind is blank to the actual term
) I would have locking clips ready for the Sceneras. I have locking latch plates and they get loose pretty easily. It's not a problem for me because the seats are FF and I take them out most weekends so they are reinstalled frequently but it could be a really annoying thing to find a loose seat that was already a PITA to install. Just from leaning over the Scenera on one side to buckle the CA, it got a little loose and it was rock solid before that point.