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....
your pickup will be ok . your problem will be that the ST tires on your trailer often will not have enough reserve capacity. a killer of tires is when they sit without moving for extended periods of time . probably not an issue with a half ton daily driver .