Biggest wheel tire combo for stock 08'??

[Dmaster123]

Hi guys! Need help finding out what the largest wheel/tire combination i can run on a stock 2008' super duty with off road package. I eventually want to add a small lift but for now im living in a hi rise w a clearance of 7'2. I want to go ahead and pull the trigger on wheels this wek and found a decent deal on a set of 35x12.50x20. Ive heard many different opinons of what will fit...anywhere from 33's to 35's. If I can get 35's and not go as wide as 12.50, thats ok too. Im more concernd w height than having width.

Thanks in advance!