Adult trike for balance disorder?

[pll]

My only reservation would be the non standard tires/tubes.

My guess is that the wheels are solid rubber, like in some caster wheels. Looks like fun to ride it.

One suggestion might be to try a few with your uncle -- I searched Craigslist and different trikes appeared for reasonable prices. Getting in and out with a balance problem can be tricky, so if the idea is to keep him as independent as possible, this is a major issue.