Just brought a new Chev Silvarado 1500 with 20" Goodyear Eagle tires. When doing a little research on the tires, which I wish I had done before buying the truck, found out they're passenger car tires....
Ditto Bob. I wouldn't worry about it either unless you run into towing problems like excessive sway or difficult to control under heavy braking. P rated tire a sometimes a little squishy for a heavy load. Pulls ok? I would wait until I wear them out & take it from there.