Don't think about it as 'bad' to train, think of it as an adventure
whenever you speak to anyone from any breed fancy, they will probably always tell you that all the dogs are different and individuals, but i think with CsV you can expect this to be especially true..
but to answer your question, "Has somebody had an experience when they had a nice car that the CSV did not destroy when young & left in the car for an hour?"
No.