Michelin Defender LTX M/S - Best Towing Tire For Half Tons 

I tow a travel trailer all across the country 3-4 times per year averaging about 70-75mph on the highway with a 7,000lbs travel trailer 3-4 times per year. I typically do legs between 500 and 1,00miles per day (8-12 hours per day of towing). This tire is a performer.