All those things listed by the OP take payload away from the truck. Crew cab, 4x4, 5.5 bed, 5.0 liter. It's not a serious towing truck. The payload is a lot more than previous model years with the same equipment.
Those tires are P rated tires. You don't get an LT tire on a F-150 from the factory unless you order at least the HD tow package.