next after Upper Stableloads? Jittery ride on rough pavement

Check your door sticker . It may be that your truck is only at its rated GVWR . If so you shouldn't even need the stableloads . Also check the tire pressure for the load they are carrying . Over inflated tires can do that . That being said there are roads that are miserable no matter what you do . The old concrete paved roads come to mind .