At long last, NPCs are polished enough to actually bother with! Only one problem:if you have a vehicle with multiple seats, and you have multiple slaves loyal followers they will waste a lot of time playing musical chairs, and this can be a real problem if you happen to have a horde closing in on your location.
So why not add a follower command such as “sit here”, and from then on the NPC will only sit in that seat so long as it remains in place.