Simp has had numerous of the ball joint type wear out early. He does run a lot of weight, so you be the judge. I did the retaining plate myself, and if you do it yourself is quite low cost. Access to large and mill makes it go quick and easy. I went full disc washers, and see no signs of running, even after being off-road. Rectangular plate would guarantee no contact. I like mechanical fastening, due to not wanting heating of the center when welding things onto them.