[BIGCWILL]

Are your factory steel wheels 18"? if so< what you have on your Titan now is P265/70R18......... your options if you want to keep your stock wheels 33X12.5-18 wich is a 33" OD/ SIDE SW12.5" NITTO MUD GRAPPLER, TOYO OPEN COUNTRY, GENERAL GRABBER, MICKEY THOMPSON are a few brands to look for.
I have a 2.5 front leveling kit on my 2010 Titan now 24X10 295/40R24 33" tire, i did have to trim the inside of my mud flaps a little bit so they didnt rub, pretty easy takes about 30 minute are less.
feel free to give me a Holla index automotive styling

 

[BIGCWILL]

Just checked with one of my vendor go 285/70R18 is 33.7", 275/70R18 is 33.2" that will give you that extra inch of meat on the ground if you go 33x12.5-18 numeric it going to cost you quite abit more money, this will give you more options & brands to choose from.