Welcome!
To start a new thread, just hit the "New Thread" button in the lower left hand corner of the first page of any section. It is grey and should take you to a screen that appears just like a "Post Reply" button and page, but will have a space for a Thread Title, and other things to get you started.
Boy, what a simple question, that is going to require (and you will receive) about a MILLION responses to. That is a very tough question to answer, depending on how comfortable you are with not following "official" policy, law, manufacturer suggestions and all of that.
Plus, it isn't just a new Coil-Sprung 2500, but a Power Wagon, with it's own unique set of brand new suspension bits.
Power Wagons are pretty rare, so you may have to wait for the aftermarket to "catch up" in terms of offering a specific 'bolt on' kit that is tested, proven and guaranteed to fit and be effective on this new platform.
In short, I would think air bags, air up the rears and go for it. That is me, and a casual, common sense approach.
You WILL get every opinion, from hard core technical, to fly by the seat of your pants.
So, I will step off this one here, and let you start your other thread and see where it takes you. I would imagine you will be heading out into the great unknown, as a first explorer with this new PW suspension system and how to upgrade it for capacity in the real world.
Until then, check the 4th Gen section under towing and see if someone else has already sniffed around about this issue. They may get close with a new coil sprung 2500 gasser, but with the whole new, multiple, unique components that go on the new springer Power Wagon, I bet most won't apply. But, it will get you headed in the right direction.
Good luck, and welcome!