Roy, hope it works out for you - don't get down in the dumps about it, because you never know what the future holds. My dad had prostate cancer, but they got it early so he made it thru. He's 80 now, but his heart is giving out. So one problem solved, but others popped up.
When he was in his 60's, he and mom full-timed for about 5 years. They enjoyed it very much. They made a list of all the places they imagined they wanted to go. When they got thru their list, they returned to home and sold their rig.
Now traveling is impossible for them, but there is really not many places they want to go now because they've been just about everywhere. I recently visited them in my B van and they were both really excited looking at it and all the adventures they know I'll have in it. I thought for a moment that the old guy was a bit envious.
I suggest you make a list of what you want to go and do and prioritize it so you can travel together and create some memories before your health gets too unmanageable. Besides a bit of money, that is the greatest gift you can leave your spouse. Probably she will not want to travel without you, so do what you can while you can.