I would have your companion/spouse drop you at the hotel and then return the car the night before. The next day ask the hotel shuttle driver if he can arrange to drop you at curbside check-in rather than the usual location as the distance would be too far for you. If you are in a wheelchair you can ask the hotel to comp an accessible ride to the airport instead of their own complimentary shuttle if their shuttle does not have a lift of its own. The accessible taxi will drop you wherever you want. This would save you time the next day, parking at the hotel and an additional day of rental.