So, I'm looking at the parts available from Ecklers (www.ecklers.com). The ram and the control valve are available for Corvettes. The control valve fits between the Pitman arm and the middle tie rod. The ram fits between the frame and the idler arm at the other end of the middle tie rod.

My question is, how hard would it be to install this system in an AD truck with original steering?

I can see the drag link would have to be modified to fit the control valve, and some method would have to be found to couple the ram to the tie rod...

Given the price of the parts, it seems a reasonable solution.

Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.