Some samurais had AC.
From what I have heard, it was always a dealer add-on though. And from the way the package tray has to be modified (cut) for the evaporator assembly, I would say that could be a true statement. Otherwise, if it would have been a "factory" option, I would have thought suzuki would have either made the evaporator to fit without modifying the package tray, or they would have made a custom package tray.
I would guess that the trackick evaporator, condensor, controls and such won't fit right into a samurai without modding stuff. I would almost bet the condensor won't even fit in a samurai (too wide). But I haven't ever measured or even really looked into trying to swap trackick AC over to a samurai, so I am just going off what I have seen with the AC systems of both vehicles.