Why not go to a trusted medical physician and have a heart to heart talk with him/her, get a good physical exam, perhaps even an exam from a cardiologist, take the AARP driving class and use all their counsel to help with your decision to drive a RV or not.
It appears that your concern is if your are mental and physician fit to continue to drive. No one can advise you over the internet about your condition.
I am 80 and I still drive a large Class A. I use a lot of judgment about the routes I take and try to keep my day's drive to around 300 miles, 6 hours, more tends to be unnecessary. After all I am retired and no one is depending upon my labor or time. Enjoy your journey and not be pressed to make any destination. If not today perhaps tomorrow or the day after.
Stay focused. Do not get distracted.