02 Super Duty wheel questions..

[Smokin 6.0]

I'm gunna put 20x9's with a 33x12.50 on my stock height 02 what is the minimum negative offset I can have .. I'm OK with a little fender well trimming but don't wanna cut it all up.. Thanks guys

 

[Jason]

I ran 18x9's on my '02 with 4.25 backspacing (dont know what the offset was, off hand), and ran a 305/60/18 which was roughly a 33x11.5-12.0 tire..and had zero rubbing. When i ran my 35x12.50 procomps on the same wheel..they rubbed on the leaf springs at full lock.