The Dark Crystal is often associated with political theory because the show displays a stratification of society into entire classes and subclasses where, incidentally, each species has a fixed place in a hierarchical top-down social order.
However, there is an even lower class down the line that is rarely mentioned that seems to steal the prize for the lumpenproletariat in terms of consciousness and that would be the Armalig that serve no other purpose other than to be the wheels of the carriages that the Skeksis use for transport. In some ways, it is funny that the Armalig are not recognized when they fulfill some of the harshest physical labor there is by sustaining the carriage of the most upper class while also used for transport by the Gelflings.