Hi, Susan in Mississippi,
Welcome to posting on FGRV. Congratulations on your upcoming retirement!
Lots of people full-time, often with pets, cats, dogs, even a bird...
I'd get as large a unit as your TV can reasonably haul, with a full bathroom/shower, if I were in your position, get an awning
or pop-up, and really think hard about other options. Some you'll really use, and some you won't, and will wish you hadn't bought.
In our case, after years of various methods of camping, we've settled on a bare minimum because we aren't going to full-time, we know that. Neither of us, at any point.
BUT, YMMV: your mileage may vary--WILL vary.
Asking on FGRV is a great way to start giving this a lot of thought; great you're thinking ahead. Be aware some of these eggs take a long lead time if you're buying new.
Kai in Seattle
(Kathleen, Paul, Cinder(ella) and Nimble near Renton)
PS: what's a LS?