I have a 2007 Ford Expedition XLT 4x4 Advance Trac RSC with a 2.5" Rough Country leveling kit on 35s. I have done my research and can not seem to find a bigger lift kit, much less one at all, than the leveling kit i have. Superlift says it has a 4.5" and 6" kit for the F150 and Expedition but yet the Expedition is all around independent suspension and the F150 is IFS and solid rear axle...so how is this? Any help on this lift kit situation is most appreciated. Thanks!