I just had a SpringTech lowering kit installed on my Escalade. 3" springs in the rear and 2" spindles in the front. I got it from Suspension Max in Anaheim, Ca. (
www.suspensionmax.com or phone 714-632-7024). I paid $330 for the kit & they installed it for another $250. I called some of the local automotive shops and was quoted between $225 and $500 to have the kit installed. A knowledgable alignment/suspension shop should be able to install it in about 2 -3 hours. I drove it for about 100 miles to let it settle in and then had it aligned (for another $75). I am running 305/35R24 tires and so far everything is good. I haven't had any problems other than some minor rubbing in the rear on the plastic fender linings which they said I could either trim with a blade or just let it go and the tire would eventually wear it away. I don't necessarily have rubbing when I hit bumps but I do when I take a corner at speed from the body lean. There seems to be a little more rubbing when turning right than turning left. I have minor rubbing in front with the wheel locked out in either direction but no different than before the lowering kit was installed.