When you get into special purpose vehicles like this, especially those not offered for sale in the U.S., the RV Industry Association's classification of RV types is not really relevant.
In Europe these things are considered to be "excursion" vehicles, and do not get classified there either, as one of the subcategorie of (motor caravan, reisemobil, camping-car etc as it varies with language). Really a different animal than RV, for a different market.
Can't always stuff everything into a pigeon hole, sometimes it is not a pigeon.