I would also have to say that in the last few years of my DH' grandmother's life. We could only drive her in a wheelchair capable van.
We found an RV rental with a wheelchair lift and that way she could lie down if she wanted and it had it's own restroom, so that was very helpful. However, we needed at least three other adults so that one could be driving, one sitting with DH' grandmother and one doing whatever else was needed. Most of the time, people came to her as it was too much to coordinate that many schedules, outlay the funds necessary and everyone was exhausted for a few days afterwards.