Nuclear fuel cell? That is pretty modern indeed!
In fact, the Moonster has no detailed powertrain and is simply an object of pure fantasy. Even so, the craft is clearly designed for the most all-terrain of any surface -- something like we might find on another planet.
Here is an exclusive rendering of how the suspension might look extended - to give a higher ground clearance.
Nuclear fuel-cells are generally the briefcase-sized reactors that keep many spacecraft in operation for years at a time. When paired with solar energy harvested via photovoltaic cells, the combination keeps our satellite television stations broadcasting and our GPS relatively accurate.
Here is one of the Moonster being lowered from a NASA Sky Crane.
The highly polished reflective skin of the Moonster might be functional as a heat-capture and harvesting system, insulating the machine during the ultra-cold depths of space.
But most of all - the Moonster is a dream-doodle come to life.
2001 Peugeot Moonster Concept