..Only system like this I've ever seen on a Motorhome that you can still get today, is the one
Power House Coach offers, their
Ultimate Vehicle Tow System.
Of course, when you build a custom coach on a Volvo HDT chassis, you can build a tow vehicle lift like that on it. They even offer some coaches with a built-in garage that will store your car for you. :)
Got to have pretty deep pockets, though, to afford something like that. It ain't something I'll ever be able to afford in this life, haha.
There *USED TO BE* one other option like this that was much less expensive: The short-lived
Electric Tow Hitch. A completely custom hitch setup that supposedly could be set up for any vehicle and Motorhome. However, they went out of business a few years ago. I can make some pretty good guesses why that happened.