Just to through some more info at ya I have a 6" pro comp lift on my truck with 2" add a leafs in back and 2" lift struts up front making a total of 8" and I'm rollin on 325/65-18's which I believe is equal to a 36-13.50-18. There is a few pics of my truck in my garage.

Also I didn't notice if this was mentioned but keep in mind a 6" lift will only give you about 5"'s of lift, why that is I don't know but every kit I've checked is like that.

 

I'll go ahead and give you my specs.

2006 FX4 with 2.5" Rough Country leveling kit.
33x12.50R20 Toyo M/Ts with 20x9 Monsters

 

I put Cooper Zeon's 275/60 R20's on my Mark LT about 1 1/2 years ago. They have been great tires and give it the slightly aggressive look I was looking for. I have not leveled my front end though. Maybe when the warranty is out.

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The leveling kit is a really nice idea and will certainly give you more of the look you want. The specs you gave are about the same as to what my truck is currently except for the fact that I have the factory 18"s still on my truck.

A bunch of leveling kits on the market ranging in price from $90 to $200. Debate on the differences is still on going and will be really hard to prove without having 4-5 trucks all the same with different kits on each and run for the same terrain and same miles.

I went with the leveling kit at first because of price and didn't think I wanted to actually lift the truck. But after a year of driving I have decided I was wrong and want the lift.

 

Damn I love the look of those Zeon LTZs. I contemplated those and the Michelins, but the Michelins won out in the end due to history. I couldn't find enough reviews about the Coopers to sway my decision. They sure do look great though.

 

Thanks. I had a hard time finding reviews when I first purchased them too. I took a chance and so far they have been great.
I probably have put 30k miles on them and they still have slightly over half the tread life left.