Lift it 4" or 6"?

[gloriavoxdei]

Hey guys, this is my first post in the 4x4 section. I'm trading my '85 K30 cc dually for an '89 V1500 suburban (Can't afford the 7 mpg as a daily driver and need a car I can fit the kids in) that I'm planning on setting up for expedition type trips. I will use it to pull my '17 camper (2800 lbs) and for various types of wheeling. I want to set it up to take maximum advange of articulation so no giant lifts with huge tires. I also don't want to cut the fenders. I'm also going to start acquiring the parts to do a cross over steering setup. I'm torn as to which will give the me the best articulation in the field, 4" or 6". Let me know what you all think.