33x12.5 should fit without a lift
Only one way to find out
Every truck is a little different
And “fit” to one person is different than another person
It doesn’t bother me if they scrub a little when you turn in a driveway or something
I think if the tires don’t scrub occasionally then they aren’t big enough
But other people have a cow if the tires touch the $13k paint on their truck