Trac Bars and Runtime (Dynamic) Caster?

I see that you've not generated any responses yet so I'll leave a comment or two. Simply, no. Body sway can impart changes to toe and camber but not to caster. I suspect if your rig was "porpoising" excessively that you would experience a slight caster change but that would be the least of your problems if that was occurring. Trac bar? A trac bar or panhard bar, establishes an axles location and roll center and has nothing to do with caster. By looking at many of your previous posts, you've already been down the road of getting your E series aligned properly. Are you wanting to know about adding a trac bar to the rear axle?