I respectfully disagree, it depends on the kind of wheeling you do more than anything else. A riding buddy breaks an axle EVERY trip we do and he's on 33's, i broke 2 carriers, bent a housing and snapped countless axles with 31's on my last tj. d30's are fine if your terrain and driving style allow. before you polish one consider the fact that you'll still have to worry about it and now it's expensive stuff making awful noises under your jeep. .02