2nd Gen Vs 3rd Gen rear leafs. What is the difference.

I have been wanting to put the 4 donut Sumo (612-40) springs on my 2015 DCLB 4x4 for additional support during towing. From what I can understand they are for 2016 and newer. So what is the difference between a 15 and 16 rear leaf?

 

Looking for experience with helper springs on a 3rd gen sport suspension?
I’ve looked at Super Springs, Helwig and SDTruck.
I use my truck as a truck, have a ARE metal contractor cap and bed storage system, I tow my 10 utility trailer pretty regularly and want to help my lil red TRD. I’m done with the 2” squat. I’ve researched the airbag, full suspension and leaf pack route. Someone sell me on why I shouldn’t just do a full length American made helper spring.

Thanks in advance

 

The metal they use in the factory leaf springs is pretty bad, and they eventually break, especially if you use your truck as a truck.
If you go the "enhance factory springs" route, you will still end up with a broken leaf at some point, when you will have to choose between spending about $1500 to replace ONE side, vs about $500 to buy a proper set of aftermarket springs that won't break and will support your load.

I'd recommend you just suck it up and buy a set of OME springs now rather than sticking a bandaid on the issue.

 

Get a WD hitch installed on your truck and trailer.