Disabled Dealer magazine often has some rv's
google wheelchair lift rv and you will find some examples
Sportsmobile West in Fresno has done a number of Sprinters and 4x4 Ford Vans and they are an OEM RV maker.
It really depends on what you want, where you want to go and who/what you plan to take with you.
Feel free to keep this thread going with more info on your thoughts as it will help others.
cigar smoking, wilderness first responding, ham talking night nurse who is overland certified and a fellow of the Royal Geographical Society.....
now everyone say "so what where have you been lately?"