It would be really interesting to hear or read the story of the Wookies. How they were formed, what happened to them, all that stuff.
I think you're right. They were probably enslaved by the Empire. Cause remember in one of the older movies, Han Solo is disguised as a Storm Trooper and he's walking with Chewbacca in handcuffs? He says to the guard at the door, "We found another Wookie out there" or something like that.
pcd927- Warrior of the Republic