I'm not sure on the size issue with the Cherokee but I'd go with a set of BFG A/T's. Oh, and it's a Jeep... not a car.
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2wd=car, JK. I had a set of Dunlop Mud Rovers on my Bronco and they were great. They smell funny when they get hot, but they have excellent tread life for an M/T. If you put a locker in the 2wd and put some M/T's on there, you'll have a blast and gas milage
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