There has been discussion on another forum, but so far I haven't seen where anyone has done it. I want to try swapping my wife's MFT with my standard tailgate but she's still not willing to let me try since her truck isn't even a year old yet. If you have a rambox (as you do) it's a little less complicated because there is no need for the extra bracing that's needed on the non-rambox beds. They will physically fit on the hinge points, but require different strikers. Then there's the issue with whether or not the second release will work because it's electric. Wouldn't do much good to have a split tailgate that you can only open in the traditional way. Then there's the issue with getting the MFT. You can't buy a complete MFT from dealerships, only the parts to build one. Although as these trucks age I can imagine seeing them show up in salvage yards.
Hopefully someone will do this soon and work out all the bugs.