I would keep your mind open to the possibility of having a 4x4 truck with a small travel trailer.
This opens up a lot of backcountry roads for exploration, gives you covered transport to the store, a large, secure and useful storage area (if you put a topper on the truck) and best of all the Pick up will be far cheaper to repair, put tires on and in case you do have a mechanical problem you still have your "house" while the truck is in the shop. Also, consider this. Getting a MH worked on in anything like a reasonable amount of time is a near miracle. Whereas a P/U has a much better chance of getting INTO and OUT of the shop much faster.
While there are good points about driving in the living area I think the pluses of a truck/TT combo wins out.
Another word of caution: whatever you do KEEP PAYING SOCIAL SECURITY. Now that I am at that age and for years didnt add to my SS account because I was in business for myself or working for foreign companies, I wish very much that I had...it would nearly double my SS check.