I'm not suggesting they should. My alternate solution was a toll based system where the trucks would pay extra for roads that can withstand the extra weight. Y

I'm not suggesting they should. My alternate solution was a toll based system where the trucks would pay extra for roads that can withstand the extra weight. You could just increase the weigh station fees, but then you'd have to make all the lanes be able to withstand the extra weight, and you wouldn't have the extra benefits of safety (a car doesn't stand a chance against a truck in an accident) and efficiency (trucks can't accelerate/decelerate as fast as cars, so they contribute more to traffic congestion).