Nonsense or not, a functional 4 wheel wagon needs the invention of independent bearings at some point. Try and turn a twin solid axle wagon around. And if the wheels are not equal in diameter even a two wheel cart will try and turn itself around or drag one wheel... Whether or not more is obviously better, more adds complications and new problems that might not be obvious at first glance.
The point of the MFMP is to come up with a replicable experiment that can be done anywhere, by anyone with a reasonable level of skill. (Perhaps even an experiment that you would be willing to try). Adding complexity might not be effective in that regard.