The concept of a Mobile Base is actually a common setting, with large movable vehicles or buildings appearing in many games, movies, or novels.
Whether in science fiction or fantasy, it is a very common setting, with many derived settings or related works.
Take the land cruisers made by the Suyia people as an example. They can also be considered a type of Mobile Base, but the Suyia people clearly developed this as a combat vehicle and not as a Mobile Base.
As for the differences, the land cruiser developed as a combat vehicle exists entirely for combat purposes. Limited by the level of technology at the time and the Suyia people's design style of being large, dumb, and crude, the internal space is narrow and is basically all combat compartments.
