Wheelies. Have you seen these?

[Greybeard]

One of the guys at my rehab had these on his chair and I just thought they were the coolest thing.

http://www.frankmobility.com/e-motion.php

[Purple Fencer]

I can definitely see the appeal of the anti-rollback feature. If I were in a chair, that'd be one thing I'd be very concerned with, aside from just getting up a hill in the first place...especially if you're tired or have somewhat weak arms.

[Greybeard]

I could have used them when I had to push through the Atlanta airport. I was in my sport chair and the airline told me they were not allowed to touch them. But she would carry my CPAP machine for me.