This debate has been around for a long, long time. It is a hard one when you consider the vast variety of combinations out there. There are the macho types that tow with a one ton diesel and probably don't need a WD hitch. You, and I for that matter are towing with a half ton. Adding springs and shocks might be a way to level out your rig but I am not sure if they actually add weight back to your steer axle.
When I started towing I was pulling a 21 ft hybrid with a 4Runner and I really wanted something to prevent sway issues. I went with an Equalizer brand hitch because it had WD and built in sway control. I have never been a fan of the add on sway bars as I feel that they are just another piece that you have to deal with. My brother has them and will often leave them off. He says he hooks them up when he will "need" it. I asked him how he could tell when that might be and of course he really didn't know.
My hitch is easy to hook up, I have restored almost all of the weight back to the front axle and the trailer is riding nice and level. I have one less thing to worry about as I go down the road.
Some say a properly set up trailer will not sway. Well, how about the handling during a blow out, a passing semi during high wind conditions and the panic evasive move? Hard to predict things like this.