70ChevelleSS covered it well. They deal with different things.
I'd go with the track bar first, if it doesn't already have one in the front (Ford began including them on the F53 some years back). It will likely do the most for steering and the effects of passing semi's. Will do nothing for bouncing, but I'm not real sure what your "bounce" is. Like after bumps, or what?
Shocks are for repeated bouncing (excessive spring rebound), but they are primarily designed to keep the wheels in contact with the road. They really don't do much for ride comfort.
You are driving a heavily loaded truck, so its never going to be like a car or even a pick-up.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC