I had this saved from many years back but thought some might enjoy another look. 5th wheel trailers have been around a long time but there have been some unusual ones along the way ... copy and paste this link in your browser if you don't see it here.
2011 17B - 2019 GMC Sierra HD3500 Duramax Diesel
Our "FIRE ESCAPE" "Put the wet stuff on the red stuff"
Very cool. I see no reason why you couldn't use a similar type of hitch on a modern car and a lightweight 5th wheel. The ability to move in any direction and basically turn the car around under the hitch is intriguing.
"You can't buy happiness, but you can buy an RV. And that is pretty close."