Costco once put a set of C range tires on my van (also Goodyear). DIdn't notice at first but when I hooked up the trailer they sure felt sloppy, so I checked the pressure. That's when I noticed. By the time we got back in town (400 mile weekend) the fronts already had visible bulging from broken cords. Costco tried to claim they didn't make tires any heavier. Finally got a manager to agree to a refund and drove to Les Schwab to have have them swapped out for a real set. Costco forever lost me as a tire customer after that stunt.
