A close friend is also a Paraplegic, they looked for a few years but ended up getting a custom Class A. Today it think both Newmar and Winnebago build their RV mobility lines. His wife had to do the setup, but most everything was push button and he could do a fair amount. Because he required a nurse 24/7 after a couple years they hung up the camping hat. We really miss going out with them but became to challenging sadly.
Do check the used market, it's a niche market so those that have accessible RVs have a harder time selling. If you work with a vehicle customer check with them about to see if they know others that might have what you need.