Our work truck, 3500 duramax, last summer had a set and they worked great towing on pavement and were pretty good on gravel or regular dirt roads for how worn they were, 4-6/32,but they werent the most impressive in mud. They got replaced with duratracs which were much better offroad but a little louder and squirmy on pavement when towing. I want to say they were 275/65/18s iirc