Opinions please. How much tread do you leave on your mud terrain tires before replacing? To the wear bars? 1/4"? More? I'm more interested in off-road use. My jeep's a DD, I will probably wear to a bit above the wear bars for street use, but don't know I want to go that low for trail use. I currently am running 32" BFG KM (and they are starting to cup with around 28K miles), will end up going to a 33" - either KM2 or Cooper STT. Maybe just looking for an excuse to get new meats now rather than later.