I installed the Lorenz Bilstein 5100 Suspension System on my '03, 3500 4X4 about two years ago & have been happy with it.
Originally, I was interested in replacing the stock shocks with Bilstein's & decided to do the suspension upgrade. It includes new front springs, rear leaf spring packs, shocks & other stuff. The system raises the truck slightly, close to what you are looking for.
With the stock system, if I drove over neighborhood speedbumps at anything over 10 mph. , I would bottom-out the front suspension. Since the installation, I have never bottomed-out the suspension & have gone over the speedbumps at 20 mph. The system seems to work.
I took a friend of mine, who hated the ride on Dodge trucks & has a Duramax 4X4, for a ride without telling him about the suspension upgrade. After riding on dirt roads that were sometimes bumpy, he mentioned how nice the truck took the bumps. I was surprised that he noticed without me prompting him. This guy is EXTREMELY fussy & I trust his impressions. If HE noticed, there is definately a difference!!!
The front springs & shocks seem to have much more absorbency to bumps, now. I think the system works.
Joe F.