Hey Kramer, click on my pic above, 16 2500, RC 2.5 spacer with the shock lower extensions. The ride is very comfy, but you will need to get the adjustable panhard bar so you can recenter the axle. When you do the level it will pull the axle about an inch to the left (drivers side) and your steering wheel will be slightly turned to the left, but that will straighten back out when you adjust the panhard bar.
Also Thuren recommends rotating the lower bolts on the trailing arms one notch to the rear to help bring caster back towards a normal setting.
This is the setup on my truck which is running 35 12.5 18 Falken Wildpeaks M/T on stock rims. At a hard full lock the tires just barely rub the trailing arms. And I mean just barely.