Originally Posted by Ford_6L_E350
Every Ford van I've looked at has a front anti-sway bar, and no rear bar.
+1 ! Even though most stock anti-sway bars are terrifically undersized for much more than the stock chassis---adding almost anything more load wise really pushes them to their limits of performance.
Most every stock suspension bushing for the movable parts are of such soft material they're largely ineffective even when brand new---after a few years they're typically degraded enough they're almost useless.
Rear bars are an option on most chassis unless they've been special ordered by the original owner.