Nice looking set up! I used to snowmobile race and had the Reese cam style anti-sway system on my enclosed 4-place trailer, at 80 MPH you didn't even know it was behind you.
I called a few folks I know in the trailering/hitch industry and no one knew of any major manufacturers making a pintle WD hitch. They siad some small players might, but the engineering behind it would be very difficult and they'd not trust it.