I also have a 2000 Sport with a 4.0, 5-speed and bone stock. It has 235's on it now and I wanna go bigger without messin with anything (spacers, etc). I mainly use it as a tow vehicle behind my RV and a round town/ fireroad run-about and a tad of off roading. So............31 x 10.5 x 15's are the way to go? Cuz I'm gonna head to the tire shop soon.