33" x what?
You'll be fine with 33 x 12.5 x 15, but anything wider than that means you should go up to a wider rim.
You need to measure the backspacing of the rim to see if it will fit and not rub. There's ways of adjusting the steering stops and the use of spacers (quality ones installed correctly) can help with the backspacing issue. Also make sure the bolt pattern is correct.
Buying used tires I would check the tread carefully and get them balanced.