In addition to possibly renting a unit to try it, take your friend fro a weekend trip in your rig ad have him do most the setup & tear down work to see if it is something he can handle.
Also as stated above, the auto leveling makes setup much easier and rentals won't have that perk. He'd be doing blocks under tires and such. I've seen some people doing 5vers with pretty limited mobility without any real problem. They are just a little slower working the process and they work a system. Had a person across from me recently who had a small step/stool he carried around to access the truck bed, step up to the awnings to adjust them, sit on if he had to do low work, and just took his time putting things away. Of course he had a Montana so he was obviously smarter than the average camper
