I bent my stab in a rut, then hit a pothole on 880 at 75mph, the stab tried to deal with the bent rod, and snapped in two... Truck started shaking so bad I thought I'd blown out a tire. Death wobble from the track-bar is about as bad. When my (first) track-bar was dying, the truck would try to change lanes when hitting expansion joints on the freeway.
The track-bar is required in a 4 or 5-link suspension. It's all called a pan-hard bar, although technically, I think that's a different geometry, but same idea.
The control-arms can't keep the axle centered under the truck. The track-bar (or pan-hard bar) does this.
When you lift the truck, the drooping of the axle causes it to swing to the driver's side with the track-bar. Draw an arc with a compass, and you'll see what I mean.
Big lifts (over 3") come with a relocation bracket that will lower the frame-end of the track-bar a few inches, to compensate for this. However, the DT uses both a replacement bracket, and a bar that's adjustable length (like a tie-rod is).
With the heim-joints, it doesn't need to be rebuilt (they don't know of a unit that HAS been rebuilt, no-one has ever bought a rebuilt kit after-the-fact, just as insurance when buying the bar).
They're friendly people, it's a really good price, and it's a HELL of a lot stronger than stock.
My first stock unit died at 19K miles, the second at 45K miles. I'm not using a Linstead unit, because it was $100 cheaper, and I needed the money.