2017 / 2018 Ford Factory 3" Receiver Hitch Extension

It can be done technically, but will sacrifice the safety.
Lately I was hauling garden sculptures on equipment trailer.
Whole trailer was probably in 8k range, but due to the load shape, the tongue was light.
I could not drive with it faster than 55mph as with any maneuver the trailer would start fishtailing.
That was with no extension, where extension is fishtailing amplifier.