There's an adage in the cruising world to "buy the smallest boat you can be comfortable in for the longest time you expect to be gone." I expect the reason there are so many posts that say that the best size motorhome is the size I have is just that: people travel for different lengths of time and have different views on what it takes to be comfortable.
One of the posters quipped that, in theory, it's possible to full-time in a tent. My wife and I did just that many years ago: two months cross-country, staying in state and national parks, in a rubber-coated canvas pup tent that we bought with S&H Green Stamps (remember those?), with everything crammed in a VW Squareback! We did just fine. Years later, we made a six-week cross-country trip with three kids, all in a Starcraft pop-up. Again, we did just fine. On the other hand, there are some who aren't comfortable unless they have multiple large-screen TVs, a fireplace, and a built-in washer/dryer.
Since you're going to be essentially full-time, take stock of what you need to be comfortable (be realistic--I doubt you're in my class of pup tenters). And remember ... you won't be "camping." You'll be "living" and what it takes to be comfortable is based on that.
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