The best ones I found are not offered anymore. Which ever brand you buy, make sure the ladders have a front pivot point or the ride will be VERY harsh and tends to break things.
Ideally, you want heim joints at all three points to allow the bars to move slightly within the suspension travel path. A properly designed setup is not noticeable during normal driving, however ladders can stiffen the rear ride during hard throttle applications due to slight leaf spring loading. One can also preload the bars to improve 60ft times if that’s your goal.
Adding a Tru-trac or other two wheel diff and things get real interesting………
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