I agree with GGZ71, and would not exceed a 3" lift on any truck, doing so does two things....
....either requires extensive and further investment in aftermarket suspension and steering assist components that are generally produced for the true off-roading arena (not street) or ...
...escalates the vehicle into a market place that will not attract a high number of potential buyers when that time comes as evident by the high number of seriously lifted trucks we all see on used car lots.
At the end of the day, its still a small market of consumers who want trucks with extreme lifts/mods.
to each his own we all say and honor, just my opinion that too much is not necessarily a good thing.