I'm fairly certain that these notes don't actually generate anywhere we can read them if you do them online. About all we can see is if you put a preference for a specific model of vehicle.

That said, on Hertz's end we do have the ability to input like 100 characters of "notes" in a special portion of the reservation (a spot for a home address for pickup service, etc), so an agent could definitely put in if you were speaking to them. Some online-made reservations are screwy and don't allow you to update them after putting notes in though.

I would never see these notes though unless I was specifically pulling up your reservation for some reason. I wouldn't see the notes if I was going through the checkout process.