Three times the damage of a tiny number is still tiny. Vans, garbage trucks, plows, tractor trailers, pickup trucks, all do significantly more damage. A single garbage truck is going to do more damage than 4000 EV cars in one pass.

That's what people mean when they say EV weight isn't as impactful as people make it out to be.

There's also the assumption that most road damage comes from vehicles. I don't know how it proportions out between vehicles and weather, but weather, particularly freeze and thaw, is very damaging to roads.