Funny reading the post. Here is what I still remember as you may remember camping has been here longer than vehicles. But somewhere in the 1960s was the VW Bus also know as the Bettle Bug, VW car and the B-van referring to the VW Bus which was most popular camping.
Then came the Class A, someone must have seen it and asked what do you call that big Bus? Someone said, Class A.
But then came the Pick-up truck camper VAN. What do you call it?
Someone smarter than me needs to set down and come up with some kind of better classification system. Fast before we see the Class Z. haha