Welcome to the forum tomcat08.
First, to improve handling a rear pan hard bar (also called a track bar) should be installed. This can be purchased or fabed by you or friends. This will keen the rear end centered between the chassis rails and end the tail waging. Then make the cheap handling fix, which involves moving the sway bar strut arms from the outside hole, to the inside hole, the one closest to the sway bar, not the end. Test drive on a known road and see if you want to do more. The Ford springs are very soft, and need some help. The harness you are feeling is because the axles are hitting the bump stops, causing the jolts when hitting rough roads. If you still want to try to improve ride, either adding air bag helpers, timbrens, or Sumotos to increase spring rates. When using air bags, you can use different pressures from side to side to level the MH, which usually lean to the right when parked on level ground. The other two systems require flat plate shims to level the MH.
