Originally Posted by ggg05a

Thanks for the tip, and I have tried this approach, however the car I am after, the car code one cannot book online. You can book D00, and W00 but not D04.

It is mildly frustrating. I called Hertz again this morning, and the lady on the phone basically said that there are a few classes of car which you cannot directly book, and it is more of an "upgrade" car.