Will 275 65 18' or 20's fit on a stock 2000 2wd Limited Excursion without rubbing?

 

I would think a 275/65R18 should fit, thats the size I currently have on my EX and they are only about a half inch taller and 1 CM wider than the stock 265/75R16s. Of course the 18" rims will need to have the correct offset and backspacing though, I don't know those specs as I run OEM 18s that are designed for our rigs.