I have the Rough Country 4" lift and I also added the Toy-Tec Add-a-Leaf...with just the RC lift alone, the truck looked like it had a slight squat to it. After the Add-a-Leaf was installed, it's sits perfectly...for my liking. I'm running 20s (-6mm offset) with 33×11.5R20 Nitto Ridge Grapplers...