Just because it has wheels does not necessarily make it a travel trailer or a park model. In this case, it's advertised as a "cabin" with all intentions of being placed permanently on a site. Mobile homes are trailers also but designed to be placed permanently in one spot. Wheels are removed, tongue is removed, and it's jacked up on blocks, underskriting,and it sits. It appears this "cabin" is just a miniature mobile home. The fact it's 14 foot wide and does require all the bells and whistles for certified movers to transport it on the road with all the required permits and exemptions for overloaded extra wide loads, means it's not an RV.
There's nothing wrong with either cabin you've identified, provided that's what you want. They do look nice, have a charm to them, appear to be well made, but to believe they fall into the category of an RV ... I think the company who manufactures them is attempting to feed everyone snake-oil there ... appealing to a gullible audience.
To legally tow something on the road without any special permits, in almost all states, the maximum width is 8 1/2 feet. Anything more than that is not a "travel trailer".
Just my opinion.
As far as the unit itself, I think it's really cute. Provided I had some property to put one one myself, it's a great alternative to actually building a house from foundation to roof, one stick at a time!