How do you help an elderly frail person get out of suv?

A Wheelchair-lift. Beyond the obvious direct assistance to the person slowly getting in-out, up-down the car/suv, something to consider is a power wheelchair lift installed as pictured here. It will cost some money, but a very hepful tool to help those needing it, especially if the person is large and cannot be safely assisted by another person. Best of luck to you.