I have a 2012 Ford F-350 4x4 SRW with about 27,500 miles on the original Michelin LTX A/T2 tires size 275/65/20 that are already showing a lot of wear. I thought I would get a lot more miles out of them. I am looking for recommendations on replacement tires. My research so far indicates that the Michelin LTX A/T2 is one of the better choices but I am not happy with the milage I am getting on my current tires!! Any suggestions would be helpful. I just replaced all 6 Tow Max tires on the Cyclone with the Michelin XBS Ribs.