Not all vehicles can be flat-towed. Pretty sure I’ve seen PT Cruisers being flat-towed. Not sure about the Rogue. AWD tends to create problems. There are online resources listing what models can and can’t be flat-towed.
If the vehicle is suitable, the next hurdle is weight. Curb weight of the towed vehicle plus any gear you plan to put in it plus the weight of the flat towing equipment will be your gross towed weight. You will also need to know the fully loaded weight of your motorhome- people, gear, everything.
Add the two numbers together to get the expected gross combined weight (GCW). Consult your Dodge chassis owners manual to locate the gross combined weight rating (GCWR), which may depend on drivetrain and other variables. If your expected GCW is less than the GCWR, then you can move forward.
You will definitely need a braking system in the toad. Don’t know a whole lot about how they work; my towing experience is with utility and travel trailers.
If the vehicle compatibility and weights work out, you’re likely looking at several thousand dollars for a complete flat-towing set-up with brakes. It’s not as simple as a cargo trailer.
You probably aren’t finding much on this forum because one of the attractions of a Class B is its ability to go most places a regular vehicle can go. A toad negates that in a big way. You cannot even back up more than a few feet with a toad attached. That said I do recall a thread or two recently, and there are folks doing it, not many.