I would check out the situation with your local car rental agencies first. When I had a car accident, i wanted a rental car afterward and there were none available at any local agency for days. When one finally came in, it was terrible. Broke down on the highway. When my dad needed a rental car, same thing happened to him. None were available for days. One finally came in, but just one. He couldn't have asked for a different one and gotten it at that time. If you live in a bigger city, maybe more cars are coming and going and you will have options.