So, in this case of the 318i, did anyone contact the person who wrote the letter and asked for more information/specs on the car to help make a decision?

Is there an "archive" with all the classed car's VTS? Maybe an online archive password protected so that the CB, ITAC, etc. can access it and have all the data that is on file for the model available would help. This should include notes on what was used to class the car and how the weight was established.

I'm just trying to learn more about this process.

Thanks for giving some insight into how it works.