....for you experts. I recently put a 285/65 R18 on my truck with a -12mm offset rim. I was able to do this with a 2" Readylift kit and very minimal trimming (had to trim the corners off the plastic bumper valance).

Could I fit a BFG 305/65 R18 w/out changing the kit or suspension...and with not much more trimming involved? I want to go bigger but the offset on my rim is screwing everything up. Trying to avoid a 3" kit as well. Any help is appreciated.

 

You should be able to eyeball it and get an idea. The 305/65-18's are gonna be roughly and inch taller and an inch wider than your 285's.