Presently I have a set of Voxx Monza 18" wheels on my 06 Impala. I've got Goodyear 225x50's installed now but would like to consider a bit wider 45 or 50 (like a 235 or 245). 40's are out of the question as the lower profile tends to ride like a "stone boat" in my view. What's the maximum size that will fit my Impala and not rub or cause conflicts in steering? Thanks.