I'd guess the widest is 11.5"... as far as fender flares, I asked about that last month... got 1 pic of a guy that used Cherokee flares modified a bit... doesn't look too bad, IMO... but the $450 price tag just didn't justify it, for me... here's the pic...

*edit* if you wanna bling bling your truck, I know a lot of the low profile tires are wider than the 32x11.5... Tracey may even have a 285 or 305... not sure, though... but it's like a 40 series...