The Sumos should help hold the rear up some, but it depends on the amount of weight the Sumos can take up.
If the space they will sit in is 8 inchs and the Sumo is 11 or 12 inches, they will help.
I had them in the front of my E450 chassis and the lifted it slightly. I took them out because the firmed up the front suspension to much. Now I get a normal rebound instead of a sharp one.
In your case, with weakening springs, they may help.
As far as a anti sway bar system, it will do nothing for ride height. It only worked to stop side to side swaying.
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