In response to a few inquiries I got about the hitch on my truck.
Pintle hooks are made by a few different companies.
There are ridgid mount and articuable mount types.
The ridgid ones bolt onto the truck directly or in the case of the H3, onto an adapter that slides into the receiver.
Articuable ones need a special designed mount to allow the hook to spin as the terrain changes.
In the case of my military trailer, the trailer has an articuable lunnette eye that spins in it's tounge so if the terrain changes suddenly, the trailer won't flip or pull the truck over with it.
Generally one of the vehicles should articulate. Ideally both.
I found that Buyers Products, makes quite a bit for trucks.
www.BuyersProducts.com
I used a PM84 receiver adapter to mount a PH15, (15 Ton capable pintle hook) and a USGI Rigid Pintle Hook Chain Plate.
The adapter fits the 2" receiver.
They also make multiple height adapters, but I thought the PM84 looked better for the H3. The adjustable height ones are a little tall, and don't look right. The PM84 keeps the pintle hook at the same level as the receiver tube, with out any extra metal on the top or bottom.
The Chain plate, just adds a degree of bulk to the hitch, and assists me in towing the trailer since my hitch pin tends to cover up the H3's chain plate holes.
