Depending on your disability or even if you are not, things to watch out for 'is' enclosed bathrooms. They are very small and many times if you are tall you can't even close the door after you sit down! A split bathroom would probably be a better choice. Before you buy TRY out the bathroom first thing.
Also I have 2 friends with disabilities that like to travel with me and they had difficulty getting 'up' into the cab area seat from the passenger door. When we tried the side entry door they then had trouble getting 'down' into the cab seat.
You will really have to physically try the different models out. Good Luck and kudos for looking for another avenue rather than hanging up your RV'ing when adversity knocks on your door! :C