I have a 98 dually ive had since new. what i did was drop the front 3" with spindles, and the rear 5" I used spring shackles and had the rear springs de arched some. Gas shocks all around and it rides nice and smooth, plus looks good. No hop or bounce on rough roads. Still can haul heavy loads and it tows great. Also have a hard tonneau over the bed which adds 100 lbs or so. To get a real radical drop I would go with the air bags. Depends on what you use the rig for.