Chevrolet 2005 Suburban 1500 tire sizes

[kowblansky01]

Hey guys! I've got a 2005 chevy suburban 1500 with stock everything (except tires). I have 265/70R17 BFGoodrich tires A/T yet they look somewhat small and want to beef up my suburban. I am somewhat inexperienced in this topic, besides from what I have read and researched. I was looking into the BFG's A/T KO2 tires (since they are bigger than my outdated bfg a/t tires) but I was wondering what is the biggest size I can get without having it rub the wheel wells, therefore not making me have to mod the front bumper or having to get different rims. Hope you guys can give me some advice and if you have pictures of what they look like or what my suburban might look like, PLEASE include them. Thanks