I got it approved without official trailer hitch. I'm running the original tatra 100 000kg, 65mm coupling. It's massive, it swivels and extends to allow for hooking up very easy. The only problem for the DOT was "no official approval stamp". I would need to mount an EU approved reciever like you're working on.
Well, to **** with them. I'll see what to do the first time some LEO points at that 700 kilo lump of steel and tells me its not a safe trailer hitch
Seriously though, I'd take a safe military trailer hitch over a cheap china model with an EU APPROVED stamp on it.
They also wanted me to remove the air couplings because theyre not auto-locking, remove the front trailer coupling because it's "dangerous", replace the tires because they didnt have EU approval stamps, add an extra low rear bumper to prevent cars from getting crushed under the wheels, etc etc etc. They basicly want everyone to drive a prius
All in all, took me 1.5 years of discussions and paperwork to get it approved anyway. But then again, I bought it without any paperwork whatsoever, so I guess they were a little more strict for me.
So, I would just leave the original pintle and get it approved without official hitch, unless you plan on using it commerially or something ofcourse.