I am running a 285/70/17's which are 32.9x11.2 without a leveling kit and it doesnt rub. I am looking into a set of 33.12.5's as my next tire and did not know since they are a inch wider if they would rub or not? Look forward to hearing from yaw..... and by the way its a 06" 4x4

 

I think you may rub just a little. Try turning your tires to full lock and measure how much room you have between the tire and the closest point they would rub and see.

 

33x12.50 will fit a stock 20" rim just fine dont know about a 17"