Need second opinion, Am I Crazy or Not

Terry, without reading the rest of the replies, I will throw my 2 cents worth in.
I think you may regret going that route. You are putting your eggs in one basket so to speak. My wife and I have been talking about the same type of thing as we are also in your age bracket and above. Our house is also way to big for just the 2 of us and we are in a similar financial situation as you, (maybe not quite as good). We have done a fair bit of research into what we want to do. Here is what we are thinking.
Build a new smaller house in an area we like that is not grown up.
Sell our present house, big profit there. Not just money wise but in the amount of work to keep it up.
Rent an all inclusive condo in the area of Florida we like for the winter months. (they can be had cheap and are rentable for any time period you want)
Keep her Murano for transportation to and from Florida and any other place we would like to travel.
We would also probably sell our cottage. It would hurt me a little but I can live with it.
Dispose of all vehicles we don't need.

The big advantage to going this route is you can walk away from the condo at any time. You don't need insurance, don't pay taxes or upkeep. They are much cheaper and more convient than owning your own place.

As far as seeing other parts of the continent, we would do that as well, but stay in hotels. What you save in gas from the R.V. pays for the hotels.

Just our thoughts. I don't think there is a perfect way to do it, but the way we are thinking about gives us a bit of a safety net.

Have fun no matter what you decide.

Jack