All I have now is the RC 2.5" with 31s, along with JKS sway bar links and track bars front and rear. I've added 1" up front to level it out, but that crazy flex picture is without them, at Interlake, no rubbing, enough bumpstop JUST to prevent rubbing (1" if I remember correctly). Those springs are nuts....slightly softer than your normal jeep spring, but long. It's like a slinky. I'm not running a BL yet, but will install the 1.25" JKS for the 35s. I have 7" between the edge of the fender flare and edge of the tire now. With 35s, I'll have 5" between them, so I'll add the BL in order to prevent rubbing. I'll also be trimming the edges of the fenders off by 1.75". With tires, I plan on jacking one end up to see if I can make the tire rub...If it does, then I'll add some bump stop. I'm planning on keeping the jeep nice and low with lots of diff and belly clearance. I'm very confident that it will work incredibly well. Up travel will be kept, ideally, at 4", since really, that's all that's needed. Down travel and clearance are more important to me, and the 2.2 shocks provided with the kit have some serious travel and built in bumpstops, allowing them to "bottom out" with no harm done. Wonderful shocks.