How to tell Your Sway Bar/Swing Arm End Links Are Bad

[PROW355]

Can someone help explain how to visually or physically inspect the sway bar/swing arm end links to tell when they have gone bad?

I have been hearing the intermittent knocking when driving over random terrain. I can't seem to find any indicator explaining how to tell the end links have gone bad.

I have lifted the beast and taken off the wheel in which to get to the Control arm, Sway bar/Swing Arm, etc. and I can see that the end links have some cuts in the rubber bushing, but I dont feel any looseness in the Swing Arm/Sway Bar. Do I need to lift both sides of the vehicle in order to release tension thus enabling the ability to feel the true tightness/looseness of the way bar/Swing Arm?

I love this Forum and everyone's advice has been so greatfully appreciated. I have learned so much and still have so much to learn. Thanks in advance.