No, for the roads it would be better to have the weight distributed on more "area", hence: more wheels and bigger wheels for the same weight. And this does _not

No, for the roads it would be better to have the weight distributed on more "area", hence: more wheels and bigger wheels for the same weight. And this does _not_ require more trucks, just more wheels below each truck. However, an even more material-efficient solution would be to use railways instead.