I don't think the 3500 SRW of current vintage has the upper overload springs.
Just to throw some info out there. I have a 2018 Dually with a Arctic Fox 990.
I installed Tork Lift lower overloads on my truck and it added that 1" or so back into the rear to make my truck just high of level in the back loaded. (you need to measure to see for sure).
I also have a Big Wig Sway bar (never hauled camper without sway bar) but the Tork LIft lowers really made a nice difference in sway, and as I said that little bit of extra height loaded over stock.
Best part of these is when your not loaded you can disengage them with a 3/8" ratchet with short extension.
And they are coming out in Stainless Steel I am told.
Personally I would never put that lift on the front. One good reason is I pretty much level when I pull onto a flat spot loaded with my camper.