I have reviewed all threads that I can get from "forum search" and have not seen the specification of height of the body (rear) with and without load (300 lbs). There are a number of threads with how to adjust the SLS adjustment lever but it requires crawling under the ramped car with it running (not anxious to do this) and after that you still don't know if it is correct. It seems just a measure from the ground, or middle of the wheel, to the bottom of the fender well could be a good approximation. Is there a spec for this? My vehicle is a 1999 E320 Wagon. Thanks for you help.