There's carbon, particulate and road wear (and noise and traffic). You can prioritize whatever you want in whatever order you want to make whatever state you w

There's carbon, particulate and road wear (and noise and traffic). You can prioritize whatever you want in whatever order you want to make whatever state you want seem like the best. If the road has to be built to handle X% semi trucks for 10yr and mother nature will destroy it in 20yr no matter what you do you lose nothing by driving a bunch of medium duty trucks on it.