The question is: what is the rover supposed to do? Idea: it rolls over the surface and somehow marks the position of ore veins. Other idea: it rolls towards the nearest non-plundered dungeon and waits there.
Maybe if the rover has some kind of hover-mode, then that'd be easier to manuever through the terrain, and also if it were used as a scanner then that'd be good too. So when the players goes to mars, he can open his ore-database-thingy or something, and see the ores location.
And maybe the rover (or droid by now) would have a camera and controls like if the player was flying over mars.
Maybe the rover could have a energy/oxygen storage so you could breath in it? And maybe the rover could just be called a tier 2 rover, instead of a mars rover?
Now, having energy and re-charge rates would make this better, and then having to make the "rover-hover" extend its solar panels for energy, or go to an recharge station.