I recently bought a travel trailer my family is living in while we build a house. It is not as spacious inside as this thing is, but I can stand up inside it without hitting my head anywhere and I'm not a small guy. It also cost only half what this tiny house is going for. My bathroom(s) are not as nice, but that said, I have been in someone's 120k Airstream conversion that had a 3 person jacuzzi in the master bath. My trailer is prewired for solar and setting it up off-grid was easy.

We talked about getting or building a tiny house on wheels instead but we settled on the travel trailer because it should be easier to resell once we've built our house.

If you want to live in a tiny house and it's not just temporary it seems easier and cheaper to just build it on the dirt. I could see these houses on wheels coming in handy if you don't own your land or have other building restrictions but still plan to be there for awhile. I wouldn't imagine these would be good for frequent moves since none of the interior is designed to "batten down" and the transport could stress the (often) wood frame classical construction.