My truck came with duals that had rusted off when I got it. An issue from the duals might be if you wanted to go with a bigger rear tank. I also ran into problems putting my single on but that could be from the PO cutting the hangers off and the gooseneck in the shortbed causing clearance issues. I had to cut the T hanger and add ~1" in length to make everything sit correct - I don't know if the T hanger location is diffrent in a duals vs single setup or if it was just a my truck issue. I went to dual stacks recently and won't go back just because of the simplicity.