Road master active suspension

I installed a pair on my DB's 2000 Chevy 1500 and on my 2008 Chevy 2500HD in 2010. They raised the 2500HD 1" in the rear and 1 1/2" on the 1500. On the 2500HD I noticed a small improvement in the ride. Both trucks were 2 wheel drive. I did not drive the 1500 but my DB is very happy with the suspension. Very easy to install. The Chevy 1500 now has 265K miles.