Because of CV angles you should not go higher in the front than 3" on a 4x4 unless you do a bracket lift like others have mentioned. You can do rough country but to make it comparable to a Procomp lift kit you'll have to add $200 front torsion bars, $90 brake lines, and $90 endlinks because the rough country endlinks are a really poor design. In addition the rough country requires cutting your truck to install the lift kit. I'll have a Procomp stage 2 lift kit with literally 300 miles on it for sale next month. The stage 2 is the basic Procomp kit but comes with coilovers, brake lines, torsion bars, and upgraded heim cst style endlinks. Pm me if interested.