Found the ad.
Sorry, but in my opinion the only thing about that "log cabin on wheels" that makes it "like an RV trailer" is the fact that it has wheels on it.
There are no fresh/gray/black holding tanks mentioned, for one thing, and it may or may not have any interior 12v wiring (ad only mentions 110v).
But for me the most telling not-an-RV feature is where the rubber-meets-the-road, so to speak. The ad says that it has two 2850 pound axles on it, then gives the GVWR as 7450 pounds. Those numbers don't add up- and even if "unloaded weight" is a thousand pounds less, it's still MUCH too much for the axles. Heaven only knows what kind of tires they've put on it.
These factors combined with the way too low tongue weight of 450 pounds means to me that it'd be a real nightmare to tow at speeds over about 35 miles an hour....and even then I'd hesitate to move it more than a few local miles.
" Not every mind that wanders is lost. " With apologies to J.R.R. Tolkien