Large machinery, but typically very low ground pressure. After all, that same machinery is designed to operate on arable soil without sinking or bogging down. It is my understanding that it is ground pressure more than absolute weight that correlates to road surface damage/erosion.

At some point axle load starts mattering more than ground pressure because whatever's below the pavement itself starts being extruded. I don't think that matters in most cases though.

yeah, the farm vehicles usually have gigantic tires too, compared to any regular passenger vehicle