Just thinking out loud again:
The
Astral Queen is now more and more reminding me of a Mississippi Steamboat.
A great deal of the planets mentioned in Season 1, and "Conscience of the King" were agricultural ones.
Tarsus IV, the one Kirk met his friend on, the one in "This side of Paradise." After all, the first thing you're going to have to do is establish a food source. (Also, this was made before TV execs purged any rural shows like "Bevely Hillbillies" "Green Acres" "Petticoat Junction" and "Hee Haw".)
And, my understanding of the old Steamboats was that the main deck was a cargo deck, while the upper deck had the "State" rooms. The "Texas" room, the "Louisiana" room, the "Missouri" room etc.
And like the old 1950s musical, "Show Boat" was a steamer carrying actors (as well as cargo)
Seems to me that if the old
Astral Queen had to load up more cargo than usual, (Say from a bumper crop.) They'd have to bump passengers as needed.
Note the ramps and cranes on the front of the ship for loading cargo and the broad deck for carrying it.
Oh, I forgot to mention:
Edit:
The Mississippi steamboats mostly moved agricultural products as cargo.