Different size tires have different load ratings, you have to use the same size with different load ranges to compare. The higher the load range, the higher the air pressure the tire can handle. The Goodyear tires that marspec is talking about are trailer only tires.
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything