I guess technically they don't say that the toter doesn't exist, just that they won't license it as an rv. Even though it is in every way manufactured and equipped like any other rv.
The really bad part of this type of law, safety wise, is that is why you are seeing the sudden appearance of race rigs with ridiculously huge "tag" trailers instead of the safer more stable gooseneck/fifth wheel configuration. Some of these huge new tag trailers are up to 40' in length (plus the tongue) and a full 13'6" height. There is nobody that can tell me that setup is as stable as a similarly sized gooseneck, but the truck towing the tag is legal as an rv, and the gooseneck isn't. Professional bureaucrats writing rules about things they have no understanding of whatsoever. Plus the aforementioned fact that every legitimate rv fifth wheel trailer NEEDS A FIFTH WHEEL HITCH ON THE TRUCK.