I need some new tires before winter and was just wondering what the biggest tire on my stock 18's would fit without rubbing anywhere with a 2.5" leveling kit on my 04 screw?

I want to buy a good all terrain tire without breaking the bank.

 

i have seen guys stuff a 325/65/18 nitto under there but i am going for the 275/70/18. The truck is slow enough as it is.