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.
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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.
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"You can't buy happiness, but you can buy an RV. And that is pretty close."