Earlier quoted context omitted.
And you'll pay a lot more in taxes to maintain the roads: "an increase in axle weight from 18,000 pounds to 20,000 pounds causes 50 percent more damage to the pavement." See: https://highways.dot.gov/public-roads/mayjun-2009/exploring-... . It's massive!
Wow that's crazy!
((vehicle weight^4)/number of axles)