We had a hitch mount bike rack that had some play side to side and top to bottom. This helped a lot. It's just a Simpson connector that I cut and bent to fit. The cut out notch allowed the pin to be inserted and the bends kept it from going too far in when the rack was installed.Getting the 4" hitch mount into the receiver was a really snug fit on the sides, but there was a good bit of wiggle room top and bottom, which translated to a lot of banging anytime the trailer went over a bump. What do you-all recommend to reduce the banging on the hitch receiver?