I agree. Our RV is a big motorhome(slideouts and all),.....but it's a tiny house. The difference is that it's handy to move it from place to place. It's at the lake (the fishing is good), and for the winter we move it south. It's the most convenient way of being self-contained, and being able to "nomad" (preferable staying where there are hookups). A small doable house, but convenient to transport (a compromise that works),.....that's what we have, and it's a sound concept.
For more comfortable living, a well designed brick house with at least 1,800 sq ft of heated/cooled floor space (with attached 3 car garage) makes more sense for a permanent location (also a proven concept).
Add, a couple of semi-permanent out-of-state locations, with full RV hookups, where you can stay for free,......and life will be good.