I'll add another thing to mine and a couple others about sleeping arrangements !
If they have any issues at all whatsoever with health problems backs, knees, hips ? Try to get one with a walk around bed or at least one side you can !
We started with the short 23Ft with jacknife couch , dinette , and over head bunk.
The dinette was too short for me , the jacknife couch folded out was terrible and having had back surgery made it hard to climb up and down to the overhead bunk.
So thinking a bed in the back (corner bed ) would work ,we sold the 23ft and bought a 25ft with the corner bed .. Found out its a pain for me to crawl in or slide in on the bed .
If I had to do it over which it still may come to that , I would want a walk around or at least one full length side where I can sit on the bed and straight board lay down on the bed..
Just thinking out loud again ;)