You have been told what is wrong with this. You ignore it. You were told that there are multiple patterns for which vehicles can be sorted many ways, such as by make or year of production or options package. You need to show that your way is better than the other ways of sorting.
Animals all fit into a grouping that is shown to be the correct grouping. You ignore that.
You sort vehicles into three groups. That is not a nested hierarchy. Here is how you form a nested hierarchy. Divide all vehicles into two groups of any size. Then divide each of those two groups into two other groups. Continue to divide any group with more than one member into two subgroups and keep track of the trees that form. When you have divided all members into many groups you have completed your task. Now show that this is clearly the optimal way to divide everything. With living creatures this is easy to do. Biologists readily agree with the order that has been determined. And repeated statistical analyses have confirmed it is correct. For instance here you will see the result for 30 divisions of life.
29+ Evidences for Macroevolution: Phylogenetics
Now try that for 12 cars. For instance, do it for
Ford F-150 pickup truck
Ford minivan
Ford Focus sedan
Chevy pickup
Chevy Suburban SUB
Cadillac
Toyota pickup truck
Toyota corolla
Toyota Camry
Toyota Rav 4
Honda accord
Mack truck
Divide these into two groups and continue to divide until you have completed trees that best categorize the vehicles. You will not be able to do it in a way that is readily accepted by all. And you certainly won't be able to do it in a way that has high statistical significance.
Dividing them into three groups is not a nested hierarchy.
The more items you have the harder it is. There are 65 million distinct trees you can form with 12 items. There are a trillion trillion trillion trees you can form with 30 items. And yet we can take 30 living things and have good agreement that this is the correct one among many alternatives. Why then can you not do the same with twelve vehicles?