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...
I see the 1140 and 1150 are in same wet weight range give or take 100 lbs, accept they are 2' longer which might act like a leaver.
Anybody with one a 996 or even a 1140 or 1150 on a new version Ram dually, would love to hear how your stock suspension handled the weight.
Worse case all I would really be willing to add is upper blocks (like upper stable loads). This does not give you more weight carrying capacity, it just allows you to carry it a little higher in rear.