Mine are 31 x 10.50 x 15 <<< The largest with mods, I think.
This is late, RB, but I figure my response may help visitors that are interested.
I have a 95 Toyota 4Runner 2WD and have been riding on 31 x 10.50's for six years now. No rubbing or fender bumping whatsoever.
Last year, I just bought my second set of Pirelli Scorpions (I got about 75k on the first pair). I do a lot of street driving, and these stick very well for my high speed L.A. city driving. Never had a problem riding off road with these -- however, I'm probably not the hardcore offroader as some -- I have put my baby thru it's paces, however.
The only thing I noticed is that the size difference from the stock tires probably are affecting my speedometer ever so slightly. I had it tested, and it appears it's only affected as speeds of 70mph. This is argumentative however.
Whether or not the larger tires have any affect on anything else relating to suspension, I don't know. Of course, with the bigger tire comes more weight. However, I think the 31/10.5/15 are the largest tires you can place on a '95 4Runner without body modification. I was told the 33's would require some mod'ing.
I hope this helps!