Ya, what you really need to look at is the real height of the tire you want to use.
My 33-13.5 15 Swamper LTBs have a real height of 32.8 inches, nearly 1/4" shorter
than their numeric sizing. Some 32s might be 32, and some might be 31.5 tall, so
it's really up to you to determine the lift you need, how much rubbing you can live
with and the tire size you really want to run.
On a side note, if you run a 33, what gears are you going to use to correct the gear ratio?
Planning on an Undertaker? is it a Daily Driver? the power is going to be really bad if you
correct the gearing, imagine how bad it's going to be with out it.
Without gearing on a DD I would go no more than a 30 or 31 tire, and that is going to
really do a number on your commute fun, I found a 235 tire on stock gears was good
power and drivability as well gives you a little more of a truck look, the next size up is
a 29 or 30 LT tire, and if you get tires in a MT design, they seem ride higher as well as look
taller, where an AT tire tends to look more like a car tire, and looks shorter, I'm not
sure if this is an optical illusion or the way the tire is built
Go to my tire and gear calculator and run some numbers, look at how the different
sizes of tires will affect your speed and how much of a gear change would be needed
to correct the gearing if it were available
Good Luck
Wild