This thread makes we want to ditch the SN95 for a fox again. I would think that 315s on a 10" wheel would be all the bigger you could fit without tubs. Thats going off memory of my old fox with 17X9's though. My tails were tight with 275's.
Ive seen 315's on Notch but it must be dumps. You have to take off the quad shocks. There has to be so bending and a little bit of cutting. I would say a few hours of work. But its worth it.