About a year ago I installed the RAS on my rear springs. For my truck I felt this system offered the best choice. My truck was leveled by lowering the rear 2", removed the factory 1" block and swapped the shackles for a 1" lower set, I lowered it this way to retain the factory ride and still be able to tow heavy loads. The factory ride is smooth because it uses soft springs, but when towing or hauling loads those soft springs allow the rear to sag and cause a lot of rebound and bucking on rough roads. I recently had a chance to snap a picture of my RAS equiped truck hauling a full cord of wood, very little sag and a nice soft ride home for my 30 mile trip.