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I've used the disk on every rig I've owned and loved it. When we bought the Montana, the hitch the previous owners used was with it, and since it was rated for more weight than the one I had been using, I switched to it. The previous owners had used grease, but as someone else stated, some of the edges had been nicked when hooking up and those nicks cause a number of gouges in the hitch plate. I smoothed the nicks and dings down with a dremel, cleaned the grease off, and installed the disk. I may still get the occasional nick in the edge of the hitch plate, but once hooked up, I don't have to worry about gouging up the bearing surfaces as the disk creates enough separation to prevent it. I've even considered getting the larger disk (12" instead of the 10") in order to provide a little more coverage between the pin box and hitch plate surfaces. Just my experiences.
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