They are supposed to count as Passengers when activated. Reports have suggested they are counting as both. This is apparently a bug, and I haven't heard anything recently to guess if it was fixed or not.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
When they are inside production crates, they count as purely weight
When they are outside of production crates [activated], they take up passenger space and weight, just like an npc takes up passenger space and weight [albiet the npc takes up an insignificant amount of weight, unless it's a box stacker carrying something]