Ehh, most of the time it's really meant to get people off the road and into public transportation. That doesn't work well in the US -- we're too large. Texas, alone, is twice the size of Germany. Texas is one state.
Further, if you want to argue that then you need to argue banning pets because of waste. They aren't "needed" and produce a small amount of pollution.
And more yet, you don't need to tax engine size. Larger engines use more fuel by nature. This means more gas. Gas is not tax-free, contrary to what you think.
And yet even more, Size of the vehicle and aerodynamics do matter. A van with an engine that can barely pull its weight will ultimately use more gas than one that can hit it efficiently. Not that this is really an issue anymore though. Back in the day though...
Finally, the overwhelming majority of pollution comes to diesel boats. The *really* big ones. Going nuclear is not cheap.
So the question I must ask you is: Do you want change to make yourself feel better or do you want change that is supported by math and science for a better world?
People don't understand there's cold asphalt and hot asphalt. Cold asphalt is just asphalt slapped in and rarely lasts. Hot asphalt is the nice smooth high ways you get. But most of them have an opinion about a field they know two shits about.