I put a Hellwig Big Wig on my 2016 Ram 3500 SRW. It helped a lot. I transferred it off the 2016 onto the new 2018 dually. I have made one 800 mile trip with it. It worked well. However I haven't disconnected it with the camper on to determine the difference running with and without it.
The installation on the 2018 was a bit easier than the 2016. Like most aftermarket manufacturers, Hellwigs instructions are unclear and sometimes just wrong because they are not updated for newer models.You will have to un-clip and bend the small brake tubing on top of the axle a little. The hanger bolting at the rear of the frame is a tight fit. Otherwise I'm happy with it. I did loosen and back off the double nuts on one of the hangers to effectively disconnect it for unloaded driving.
I would make 1 short trip without any mods just to see what it does. I would bet you will want the sway bar, not sure about the StableLoads. My Bigfoot is about 4500# wet and heavily loaded. Only mod I have is the sway bar.