2wd or 4x4 makes a huge difference there. For sake of what I know, I'll assume you have a 4x4. 285/65/18s will run fine just stock... BUT with a 2-1/2", UCAs, (or coil bucket cut) and pinch weld mod, you can clear 295/70/18s lock to lock, and full travel (My set up, with struts, coil bucket cut, and pwm). I have heard of 325/65/18s on a level as well. Anything wider or taller with stock wheel offset and no spacer will rub the frame, fender, and liner with offroad travel or drifting shenanigans. If you go 2-1/2", you'll have a slight nose up stance, usually with that, folks also go with a 1" rear block as well. Now a wheel spacer will keep your treads off the frame, but will increase contact with the fender and (sometimes) bumper... both can be modded and-or replaced to clear larger tires, but it comes down to how much mod you really want to do, if it's just for look, or for function, and if you want it done correctly, or just easily. If you are 4x4, then don't go past the 2-1/2" or you'll need to start replacing your CVs. If you're rear wheel drive, then you can go higher, but the CBC (coil bucket contact with the underside of the upper control arm) gets worse as you go higher unless you do a full spindle lift. at more than 1.5", you will have CBC no matter how you drive, or if you ever hit the dirt or not.
My advice, is whatever direction you go, factor in a set of RC or DK UCAs, My setup works with stock UCA , Rancho 2" quicklifts, and an aggressive cut on the coil bucket for clearance (A FAR cry from my target setup), but it isn't ideal, and I don't know if it will hold up or not in the long run, where aftermarket UCAs are tried and proven.