To put some numbers to this, lets take the model that damage scales with weight per surface area to the fourth power. If you double the number of axles but main

To put some numbers to this, lets take the model that damage scales with weight per surface area to the fourth power. If you double the number of axles but maintain the same weight. Then there is half as much stress on twice as much area, 16x less damage per area, 2x area. 8x less total damage.