I'm looking into an ATV, I'm fortunate enough that I can still work and am not on oxygen as of yet. It is hard on me to walk up hills, and the thought of dragging a deer out when I'm a half mile or better in the woods is not a pleasant thought. It would take me along time to get one out, even with help. It is the main reason I stooped hunting, I am getting back into it though. I did hunt last year as my son got back into hunting, I didn't want him out there alone. So I bought a rifle and went out with him, I walked out to a couple spots I used to hunt and just sat. I had no real intention of taking a shot, just being in the woods was great though. Walking on reasonably flat terrain is not that hard on me, it just takes me a little longer than most due to taking breaks along the way.
I hope the ATV will make a difference, and it might help you. I really hope you find a way to make it work and enjoy the hunt.
Jeff