I've seen people build such things for their jeeps, but that's usually for serious offroading, i'm talking hill and rock climbing. I'm not sure what the real benefit to a pickup truck would be.
If you want to set it up, you'd use a setup similar to a center tap rack and pinion. both shocks would be anchored to the frame via a ball joint setup. I've seen what look like ball joint shocks, but it might just be a good retrofit. Either way, you'll need to anchor the other end of each shock to the center link between the pitman and idler arm. With the steering centered the shocks should be at half extension. To size the shocks, you'll need to measure the horizontal travel of the center link then add 1 inch to account for extra travel to cover the extra possible travel from certain mounting locations to the center link.
This is what I remember from looking at my buddies old jeep after he cobbled together a steering stabilizer from parts from a junker sitting behind his barn.
One of the important differences I noticed after taking his jeep for a spin, it takes a while to turn unless you work really hard. It almost feels like driving a car without power steering, especially at low speeds and when stopped. In his case, the jeep isn't his daily driver, he puts it on a trailer and tows it with his pickup out to various off road trails.