Starship Manifest Heavy Industrial Platform Prefab automated heavy industrial and mining platform. Something to convert a comet to a space station and mine all the fuel this ship would need to get home. Its a guess. Say big enough to carry a one or two of 18 wheelers. Can land and take off from a full G moon.
Ships are modular so they can be taken apart and rebuilt as heavy tugs or whatever.
This would also allow them to be stored more compactly in the ship. Drive systems would be Busard fusion reactors heating water as reaction mass. Side view would be more diamond shaped. This way it can carry more and has unlimited range in atmosphere. These do the light shuttling around and supply runs to the ground exploration teams.