Do you just not want to rely on your personal auto insurance coverage for this particular rental, or do you not own a car? If you do not own a car, are you sure that your other personal insurance will cover you for injuries or property damage that you may cause while driving a rental?

If the former, and if you have at least Amex-branded card, consider enrolling that card in Amex's Premium Car Rental Protection program for this rental only, and then dis-enroll at the completion of the rental. Here's the link to the Amex program:

https://www152.americanexpress.com/f...?source=search