I don't have answers to all of those questions W2R, but have asked myself all of them (and more) and find the potential for change quite exciting. I'm not about to give up this apartment, as the rent is so well below market for the area, but would quite welcome the forced change if it were to change hands and the new owner knock it down to build another income property (which could well happen). I'm a big stick-in-the-mud and love my routines but truth be told, I get far too attached to them sometimes. I doubt that I would take to the road in an RV if I still had this place but if I were forced out, I'd welcome the opportunity to open a new chapter of my life and be the protagonist of the new, exciting story, "Tom On The Road With 3 Cats"
If I hit the road, I may keep a permanent base, and address, at an RV park - or will maintain a mailing address and domicile in CA, or another western state. That should work for the purposes of health insurance. I qualify for Medicaid under the ACA Medicaid expansion, so would keep a domicile in a state that opted for the Medicaid expansion. I know many people here are more concerned with fashioning their finances in order to avoid falling into Medicaid territory, but I have been very happy with the care I have received.
If I don't hit the road, I'll find an apartment that takes cats. Dogs are tougher, but many apartments take kitties. Finding one that will take 3 may be a bit harder but I'll do what it takes - and my eldest is 13 now, so she may have crossed the rainbow bridge by the time any change happens in my life. I love my feline companions so much that I will do whatever it takes to keep them with me.
The "what about my girlfriend" question is a trickier one. You may have noticed that I refer to her as my SO rather than my girlfriend. I may just be kidding myself, as I am very attached to her, but we are quite far apart in terms of where we are in our lives, and in our approaches to finances, so I have been cautious about aligning my plans too much with hers. If I move into an RV, she is open to the idea of me coming to pick her up at weekends and getting out of town for a break. She absolutely adores my kitties, so as long as we get to see each other fairly regularly, and she gets to hang out with the cats, I think that will go a long way to allowing us both to follow our individual desired paths in life, while still being able to maintain our friendship.
I just turned 52 (Happy Birthday to me!) so hopefully have many active years ahead. I'll most likely want more certainty by the time I hit 65 but for the time being, rather enjoy the prospect of future change. I get my feelings (illusions?) of stability from my 2.05% WR, the promise of SS in the future, and my relatively minimal material wants. Basic physical comforts are important to me, but the rest is gravy, as they say.