This load-range designation means the tires are more durable (as much as 10-ply), and designed with larger beads and deeper treads than Passenger-series ("P") rubber, for longevity and higher mileage.

New Blizzak Snow Tire Targets Heavy-Duty Pickups. By PickupTrucks Staff. February 24, 2018. ... The tire also features a new rubber compound that is supposed to extend the tire's life.