we have a 2015 Ram 3500 tradesman addition dually 4x4 crew cab long bed. Cummins, Aisin trans. Torqlift steel tie down system. GVWR is 14,000 lbs. following info from Ram Body builders guide: em...
If you're not squatting yet with what you have, another 1500lbs isn't going to put you in danger. I would put you at dead level to 1" low in the rear.
Even if it's not ideal it won't be so horrible that you can't take a trip or two with it to see how it's going to work out before deciding what you want to add.