It's all about the math. Factory drive rod length and CV joint meshing are the main restrictions.
If you want more lift you will need more parts, and I'm thinking that the cost out weigh a price-point that is marketable.
You would need longer drive rods, either two or four, longer upper & ower control arms so that the wheel base width isn't too narrow. That is a lot of geometry and engineering. Prolly need a larger sway bar as well as trailing suspension arms.
Even if you arrive at that point you will need wheel offsets for your taller/wider wheel sets. Cost would run at least $3000 installed if it was mass marketed.
For now it would be purely and simply a TOTAL fab job, and a lot of hit or miss. RRO took it upon themselves to develop the geometry for the rear, quite a business risk if you ask me.
You have to remember that Pats aren't on solid axles where lift blocks and longer driveshafts are what you are buying, Pats are by far more complex.
Mark, I had a 4 Wheel Parts do my install, and they had no idea that anyone had produced a lft kit for the Pat.
Love our RRO lift,
Al