Got a 2008 Silverbirch CC 4x4 on GMC 20's, but need some advice on tires.
With a 2'' leveling kit, can I run a 305/55/20?
If not should I run a 305/50/20 or a 285/55/20?

Im thinking of the Cooper Zeon Ltz's or Terra Grapplers.
I wont be doing any off-road driving and its not my DD either. So should I stick with All Terrains or Mud Terrains?

 

Any of those sizes will fit with a level kit..
As far as tread type its allup to you lol..Mud tire will be loud and offer a rougher ride than the at...

Post up some pics when you get it all sorted out

 

I'd run the 305/55/20s, same as in my sig.

 

So a 33'' tire will clear with a 2'' leveling kit? Is it worth spending the extra money on 33'' over a 32''?

 

I ran 33 firestone destination mt on mine with the stock keys all the way up. I like the stuffed look and enjoyed the road noise. the price diff isnt that much, about $30 a tire lest time i checked, and its worth it for the overall look of a large tire in a small well imo.

 

I also run a 305/50/20. anyway i need additional tires but can you tell me where can i buy some? thanks a lot.

 

Which tire? I order mine from Tire Rack.