When I purchased new tires for my F150, i wanted a higher load capacity tire but didn't want to go to a heavy LT tire that would lower my non-towing gas mileage. I drive the truck about 50,000 miles a year. I chose Hankook Dyanpro ATM extra load tires. You can air them up to 50 psi instead of the standard 44 psi maximum. The truck tows much better than standard tires, but still has a good ride and gas mileage when not towing. Do they tow as good as LT tires? Probably not but it is a good compromise. Other tire manufactures make XL tires also.