So this may be a question with a simple explanation but I'm at a loss to know what it is. I've noticed that many of the people that have large lifts on their trucks complain about the increased ride harshness due to the higher spring arc. Is there any reason why someone couldn't lift a truck(even if only the back) by making a new section that sat say 8" lower and reusing the stock spring pack and mounts there? Obviously it would be harder to reverse but you could use the stock mounts to center the new section and bolt it there to hold it while you weld in the rest. I guess you could even just grind through the welds to go back to stock if you wanted. Just a thought.