Traditionally on Earth, the pastoral nomadic lifestyle stands in opposition to the sedentary city lifestyle. Ibn Khaldoun, an Arab philosopher of the 14th century, was the first to formalize that observation in social science terms in his book Muqaddimah, in which he analyzed the rise and fall of medieval Arab realms. However, technology occasionally provides the right tools to overcome constraints posed by nature.
Here is a article on how to construct nomadic towns with technology that is only slightly more advanced that what Earth possesses today — link >>>
So such a construct would fit into the worldscapes of SF-games like Traveller (the ship-borne towns in Nomads of the World-Ocean are a maritime equivalent), Star Wars D6 (consider the Jawas’ village-on-tracks in Episode IV), and 2300AD, where human corporations exploit alien worlds for their natural resources. The 2012 movie John Carter introduced the “walking” city of Zodanga, a more spectacular-looking science-fantasy version for Barsoom (the “Mars” of Edgar Rice Burroughs). And the picture below shows us a dieselpunk rendition. Ergo, this is a flexible concept that suits plenty of SF sub-genres.