Just my opinion I'm no professional in this subject, from what I have seen on about all brands of boat trailer tires if you work on your axels every time you see this on a set of tires your in for a lot of axle maintenance. You will never make me believe this problem is caused by axle problems,IMO it's tires most trailer tires are rated 1500 lbs and 55 mph speed,,,,,Now how often does either of those happen 20' boat fully rigged behind a 3/4 ton diesel truck. I have switched to an Endurance tire guess we will see how it works out.