I think in 2013 they changed the frame completely making it wider. That's not saying it couldn't be done, a torch, welder, a BFH and a can of paint you can do about anything. On the 12 Ram I had I used the Reese elite setup which included the under the bed frame puck mount but it was for the smaller puck arraignment setup as is now used in the new Fords. With that being said, if you found a later model setup it possibly could be modified/narrowed to fit your 12 and fit the existing holes in your bed but you might also have to move/relocate an existing cross member on your 12 frame.