I've got the STT on my Explorer and they suck in the snow, I've found myself sliding through quite a few intersections even with the ABS.
54'' Boggers. 66'' monster truck tires would be a little tight, probably rub the mirrors a little...
you can fit 33's
i would run either 33x10.5 or 32x11.5 on a 7" rim. Get 15x8's and run 33x12.5
You could clear 33's quite nicely but on a 7" wide rim you don't really want anything wider than 10.5, maybe 11.5 but I have heard of people running a 12.5 on a 7" you just get more sidewall roll and it might be harder to keep them wearing evenly that way.
I'm gonna say 33's for sure (no rubbing), 35's maybe (with a little rubbing).
Thanks, finally someone answers my question.