We had many requests from users of our popular App for travelers called "Room", for an App that stored their rental car details.
If you lost the keys or even the car for that matter, would you remember the details of the car? Make? Model? Color? License plate number?
With Rental Car you can store all those details for one, or even multiple cars. You can even change the color of the tag if you want.
Rental Car also allows you to add a contact name for each entry you make, either enter it manually or select someone from your Address Book.