My Texas Edition SR5 came stock with these 20" wheels. They are great and look outstanding. I dont know what tire it came with, but it has Goodyear Wrangler SR-A on it now. My problem is traction in wet weather. I just barely accelerate and they spin. Even at highway speeds if i have to punch it for any reason, they break traction without even trying to gain speed. I haven't had trouble with it stopping, thanks to ABS.
I do know a little about tires from selling and installing them for 11 years. But that was 15 years ago.
I know there is a tire designed to perform best on this truck in this size. I just havent found it yet.