I really liked the removable hitch that Recht71 posted, and removable hitch in
the other thread that mlwats1 started is pretty cool too.
Yesterday I spent some time crawling around under Mah Deuce, and this is what I came up with. I liked the basic idea of the removable hitch that Recht71 posted, but I wanted to brace it a little bit differently. So I designed these brackets, which would be bolted to the outside/bottom of the frame, directly under the rear crossmember. I would use the grab-handle holes in the sides of the frame, and the three rivet holes that secures the rear crossmember to the framerails (drilled-out and replaced with bolts). I would also drill several additional holes in the sides of the frame in order to distribute the load over a larger area.
The crossmember makes this part of the frame very strong, and the double-shear brackets (could even be boxed) also make it possible to make those attachment point quick-release. But I'm building Mah Deuce to travel, and I didn't want to have to carry that hitch in my trailer, I was planning on using the brackets as pivot-points. The whole the receiver hitch assembly could fold-up and lay flat under the framerails.
That would be a pretty slick setup, but the more I think about it, I'm not sure I'll end up building this. I think I might just build a simple 2.5" receiver that will mount right under the pintle-hitch and bolt directly to the rear crossmember. I've got a idea of how I might be able to brace that to make it strong enough, and it would be a much more compact (and permanent) solution. I'll post some more screen captures and pictures when I get around to that, but I figured I show everyone these bracing brackets in case any of you want to use this idea. I can even provide you with my measurements and/or CAD files.