> I think vehicles should be taxed by weight, length, width, and height
Roughly speaking, they are. Unfortunately, the system didn't quite get the memo, so there are two classes of vehicles based on size here; car, and truck. small trucks, like we are discussing here would fit into the car category. unfortunately, because they fit into the car category, they have to follow the car rules, which they can't, which means they don't exist. all the bigger vehicles fit into the truck category, which has more lax standards about certain things, and which is why we have such big SUVs.
I think vehicles should be taxed by weight, length, width, and height. The bigger the vehicle the more likely to cause an accident and the heavier the more likely for the accident to be severe.