I have the 15 version of that truck.
first I do recommend the Big Wig sway bar. really helps stop the sway (the correct way).
But I disagree with air bags. The truck is designed to drop some before the over load springs contact the frame perches. Put on air bags and the truck never drops down to make contact.
I would put Upper Stable loads rubber blocks on the frame perches. what this does is cause the over load springs to kick in sooner, with less drop. this along might save you 2 or 3" of suspension drop.
they also give a rubber damping affect for a little more ride confort if your right at the point the over loads are starting to hit.
With my wolf creek on running around 3500 lbs plus a trailer with 500lb tong load I am not quite level, high in the back. if I park on a level spot I might need 1 layer of plastic yellow blocks under front tires (1"?).
on my 2006, I ran energy suspension blocks on the spring perches. Below picture is after 9 years and maybe 60K miles. I think the energy suspension blocks cost $50.0o for 2 pair. Direct bolt on solution. The torklift upper stable loads are like what I am showing below, only they are solid so they might work better.
On my 2006 the most I ever loaded was 3500 lbs, and they would look pretty squished but they did the job for me.
PS: not sure what our driving now, but the rear torqlift hold downs off my 2006 SRW 350 fit the rear of the new truck.