What is the width and offset of the wheels you will be using?
I have 285/75 16s (33x11.5) on the stock 16x7 wheels w/4.5" bs on a 2000 XLT 4x4 w/stock suspension. They don't rub anywhere ever. I'm pretty sure you can go up to 305/75 16 without any issues, too.
I think if you go taller than 33" or wider than 12.5" (on the stock wheels anyway) you are going to have to trim the edge of the airdam to clear the tires when they turn.
Also, if you are using the stock 17x7.5 wheels, I think a 13.5" wide tire is too wide for that rim. I think you are supposed to keep the difference between tire width and wheel width within 4" at most, as a general rule of thumb. You would be better off with a 12.5 or 11.5 wide tire.
If you are going to use 17x9 or wider, it's all most guaranteed you are going to have to trim the lower part of the front bumper.
Hope this helps some.