When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
These trucks are built more and more like the proverbial One-hoss Shay. I doubt the axles are rated for any more than the springs, so if you increase load you are going to be stressing the axles.
For towing I would prefer supplementary methods, so that when you're not towing you get back to the factory suspension. Air bags are a great option IMO.
Extra height and towing don't usually go well together.
AAM 11.5" rear springs won't just drop in a ZF 9 1/4" so you'd have to fabricate just to get them in. Why not just buy heavy duty springs made for the truck?
Agreed with above. There is no shortcut to increased payload/towing. Springs alone won't accomplish it. It's only one part of a system of heavy-duty components. As usual, the quickest and cheapest way to achieve 3/4 ton rating is to purchase one in the first place.