Finally have a moment to post back about the suspension upgrades I made and how the RV drove. Now consider this is a 2004 jayco 31 foot MH! A lot of weight and length! I drove about 1200 miles.
I drove mostly on interstates and to my surprise I found my speed was touching 70+ often and I never even noticed it. The RV felt tight and zero wander. Going through the corners the RV had a LOT less sway - still some but a lot less. Trucks going by no longer pushed me off to he aide of the road!
My opinion - ball joints, alignment and tires made a marked improvement in the handling. Steering damper a slight improvement. Shocks not as much for the cost of them. The sway bars a marked improvement in the handling, as they made the RV feel tighter and that the driver had more control over it.
That's my opinion after all the changes I've made to the MH suspension.