Originally Posted by TJ911
Has anyone seen this video? https://youtu.be/b734eSPO1gI
It's a dolly designed for gooseneck and 5th wheels. It looks interesting and if legit could save $$ when choosing a tow vehicle
Very bad idea.
The big advantage to having a 5th wheel is that it's easier to back up and can make tighter turns than a conventional trailer. Using this thing makes it impossible (or nearly so) to back up, eliminates tight turns and by making it a 'double' might even be illegal in some places.
It might work if you have a requirement to move a lot of trailers around a parking lot and have only one tug to move them, but even there the difficulty backing up makes it marginal for use.