Firestone sells two different models for the Ford and it may be the same for Ram. One model goes under the frame rail and replaces the OEM bump stop - This is used with fifth wheel hitches so they do not interfere with the under bed mounts. The other model attaches to the outboard side of the frame rail and sits on top of the leaf pack. If you choose the Firestone bags, pay attention to which kit you are pricing. I feel that not having an internal jounce should eliminate Firestone if you need a setup that does not interfere with your hitch.