I have a 2359 trophy on a double axel trailer. I just went to check out my tires and found that the back two have worn on the inside and needed to replaced, so I did that today. I just put these on 2 seasons ago. And the front two I had to replace last year due to the same problem. Just wondering if this is normal for trailers? I mean, when I pull our of the driveway or make a sharper turn, I can due black left behind from the tire... so I would imagine that with multiple turns that maybe this is just normal wear. I have on radials now, not the bias, as it seems at least I will get a little more life on the tire. Should add that I don't know the total weight of the boat loaded on the trailer. But, I know that I'm probably at the top of the rating for the trailer, if not over.