As far as helping you to get in and out of cars, look on the internet for car swivel cushions. You can even do a car seat swivel cushion rating and reviews search so you can compare the cushions and see which one might work best for you. They mostly cost less than $30 and are portable so you can move them from car to car. For your husband's car, it can be modified with a handle to help you get in or there are automatic car seats that will extend out from the car and retract once you are seated. They are expensive but your insurance may pay for the modification. I would also contact your local Center For Independent Living and see if they can provide assistance.
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Thank you for your suggestions about the swivel cushions. I will consider what you said.