Wow. I know my '03 H2 NEVER went out of alignment in 50k miles. This one goes out driving down the road if I hit a bump or hump where the weight is lifted off the front end. I couldn't figure out why in the world this car would be so much different. I got the dealership to replace an idler arm, but they swear up and down that the pitman is fine. I replaced the centerlink after the last Moab trip and, of course, the tie rods are new.
Lift the front of your truck, the front wheels droop because the weight is off of them. The centerlink is rotated and the tie rod knuckle flexes too. If the shocks are soft (or in this case, soft on the extension, stiff on the compression) the centerlink will let the wheels droop a LOT farther. This extra extension is one reason I got rid of the Rod Hall racing shocks. I had a brand new loaner H2 and put it up on a rack and the centerlink barely moved. I drove it off road, and the steering wheel didn't bob back and forth going over the bumps. I'm still not sure if the shocks were the cause of some of the alignment problems but with the extra travel it couldn't hurt to take them off and try something else. I put the Ranchos on and went back East and wheeled at Paragon and came home, and the tires aren't showing any signs of wear or feathering after 7000 miles. No pulling left issues like I had before, and the steering wheel is still straight. I've had lots of weird alignment gremlins.
I hope all that makes some sense.
Please keep me posted on this would ya?
If you'd like Trent to measure anything on mine, just let me know.