Fifth wheel attachment

Does anyone know of regulations pertaining to attaching fifth wheels to trucks?
I am planning to use a military double oscillation fifth wheel because I don’t like the way the standard ones twist my lowboy on some jobsites and dragging through ditches at road corners that weren’t made for long trailers.
The military bolts it through the flanges of the truck frame with 10 5/8 bolts which I won’t do. I am thinking of building a track with 5/8 thick angle iron to bolt to the side of the frame like we normally would do and then surround the fifth wheel mounting base and bolt or pin through both pieces so I can still move it front and back.
I know holland makes kompensator fifth wheels but they don’t have enough side to side.
Would this be leagal or against any rules

 

Hopefully my hideous drawing helps show what I am thinking

 

I suppose that would work but it’s a stationary fifth wheel so I wouldn’t be around to move it. Maybe that’s not a big deal I have two trucks but I like it pretty far forward and can’t clear the landing gear on my 24 foot dump

 

I could probably mount it to a flat plate or wide flat bar and then bolt it on like a conventional outboard one and just manually slide the whole thing and rebolt