You may find my newbie experiences shared here
http://www.trailmanorowners.com/foru...ad.php?t=18578
interesting.
I'm actually surprised that your rear end dropped 2" on your 150. The same thing happened to my Tahoe when I hooked up my 2720. That's when I went on a scale, and checked the specs. (see the thread) I got the WDH at that point.
This spring, I changed out the original shocks ( autoride shocks) and replaced them with Bilstein 3100. I now have almost no sag in the rear. I still use the WDH though. Even though I don't have any sag with the new shocks, but the physics determine that the weight is still on the rear and taken off the front. This wil, to some degree, compromise my steering and braking abilities.