On my last truck I had Bridgestone Dueler A/T Revos, and they were awesome tires. Great traction in any conditions, and I was very pleased with the tread life. I think I had 45,000 miles on them when I sold my truck and they still had quite a bit of life in them. My new truck came with Good Year AT's on it, and I've put almost 50,000 miles on them and they are getting pretty bald. I really would like to put another set of Duelers on there, but they dont offer them in a 20''. I've also had good luck with BFG A/Ts. Bridgestones, Good Years or BFG's would be my 3 picks.