Removing the factory hitch is a big job. It is integrated into the bumper and placed between the frame rails and the bed. So it is probably more work than it is worth in weight savings. The 2nd gens were easy, but now any aftermarket bumper hitch gets installed IN ADDITION to the factory, since it is such a PITA to remove.
But it can be done, the bed need to be unbolted and lifted to do it tho!!!
---Doug