While many terrestrial mobility platforms have been very successful, why are we spending millions to every rover device making it unique?
Sure enough, different worlds offer different conditions, but why not build a more or less general purpose chassis say for the Moon or Mars?
That is, will such make sense at some point of time with enough budget and sufficiently mature component technologies, or is there a reason why we will be ever creating unique mission-focused vehicles from scratch, never reaching a (low scale) mass production level? Or do they actually use already a more or less standard chassis being reconfigured by mission?
=== UPDATE ===
A "mobility platform" is meant to be a general purpose vehicle design which can be modified for different purposes and of course it should be developed over generations. True enough, after building first dozen of cars, nobody yet was thinking of that. Nevertheless, on long term modularity where it makes sense might pay off.
Example: UNIMOG. It does not seem like its wheels' design is much under influence of what they mount on top: sure enough it will have a range of acceptable parameters.