2019DenaliHARD

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I have a Question I am really baffled by. I am looking at a set of Fuel Beast wheels to put on my 2015 Sierra . I already have a Rough Country 2.5" level kit on my truck. I want to get a set of BFG AT K02 tires as well. the wheels I am looking at are the 20x10 -18 offset . what's the biggest tire I can get on these without rubbing . I was thinking of 25/65r20's or 295/60r20's but i'm not sure if that's too much sidewall or not for just a 2.5" lift/level. Has anyone done this or have any input. I was hoping the -18 offset would allow me to run these .My end game plan is to run a 6" Fabtech or BDS lift but I just want something to hold me over a year or so till I can scrounge up the extra cash. Any info on this would be greatly Appreciated.

I was planning on the Fabtech 4" kit with these. Did you have any issues with the offest and the RCX Kit and Control arm clearances at all??

Hell no to a body lift lol

So my question is what 4" lift can i use my stock wheels and tires with . Fabtechs 4" kit requires a wheel spacer which im not a fan of and RC doesnt specify and i like the look and cost of readylfts SST 4" kit but it does not state whether the Control arm will rub on stock 20's or not. Anyone have any advice? I want to stick in the 4" range

When you put on this 4" kit dod you run stock wheels ?