Old fashioned automatic level systems use a lever between the frame and the axle to determine level and ride height. Most competitor levers are hard to mount and calibrate, and prone to failure. Now Air Lift solved the problem with SmartAir, an exclusive automatic leveling system that has a no contact arm!
So far so good. Had to troubleshoot some of the front mounting for the sensor but no big deal. the customer care of sd truck was very supportive. they clear all my doubt .I recommend every one who love there vehicle sd truck is the best one .
Excellent product and a very satisfied with the customer service.