LuckyX
Stormtrooper X60D, Autopilot, and Hitch
Definitely three. There was good picture through the back window that showed them, but can't find it now.
3 would be great but But seems like they'd have to be slim style seats as it seams the outside width of the 3 is 10" thinner than the S. However may not be much of a difference on the inside.