That's not what your asking. If you can quantify externalities una suitable manner then do so and hold them responsible? If you can't and you decide to ban instead that tells us it's more about control than anything.
You have no idea what I do with my vehicle, yet you believe you can make that vehicle illegal. This is while your own actions and consumptions lead towards a disaster, which should certainly be made illegal as well. Whatever they are. I don't even need to know.
Taxing something and making it illegal are different things. And the damage caused by larger vehicles is not hard to understand. Damage to roads and emissions are simple functions.
And yeah, my behaviors that have harmful externalities should also be taxed.
The original post did not say that externalities should be taxed. It said, "SUVs and all large trucks that are not real utility vehicles should be outlawed".