Sway bars helped mine. I didn't do shocks but mine are borderline inadequate on a "lightweight" 24 footer.
Off the bat, weigh the rig front and rear and set tire pressures to the weight (mfg should have a spec on that). You don't want front tires overinflated. Try to shift weight forward when possible (not heavy in overhead cab though).
Dig through the posts here in the C forum, looking for member Harvard and his thoughts on caster. He recommends maximum caster under the Ford spec, not the intermediate value. I would also recommend a tad of toe-in, not the zero degrees recommended by Ford. I'd go to alignment shop with specs in hand you want it set for.
These things will never handle like a million bucks but they can be a lot better. They're never a lot of fun to drive in windy conditions. In general getting used to it will help, and I think they feel a little more buttoned down when the tires wear in a bit.