You have alot of options for 33" tires on either 16 or 17 inch wheels ---- the 16's will be the most economical and feel the best off road.
I have 285/75-16 on my Sahara with 4.5" of backspacing; if I had chosen a wheel with 5" backspacing, it would've fit perfectly. With 4.5" though, the tires rub a little on the rear fender at full-stuff. It was less expensive to buy 5 of these tires and the wheels than to just buy 5 of the same tire in a 275/70-18; go figure.
In your search remember that some tires are taller/shorter wider/narrower than advertised. A mud tire is usually taller than the same size all terrain and the AT is usually wider at the tread but not at the sidewall. So, depending on the wheels/tires, you might buy a 33" tire and have no problem with rubbing or it might rub suspension or fenders.
It's easy do it right but even easier to do wrong....