1-7/8″ Trailer Coupler Repair Kit – 2000 lb Capacity, Universal Fit for 2″，2.5”，3″ Channels, Heavy-Duty Steel, Locknut & Quick-Release Design

Did I install incorrectly? It pops off easily. There was no directions included and i threw the old one away. There is a horitzontal pin that maybe the holding plate goes under instead of over? It seems to be shaped to go over. Really can’t figure it out. (later) Figured it out. I hadn’t tightened the nut enough. I have a fear of overtightening stuff. But it has to be tight enough to work This nut has a nylon internal washer so it won’t slide off if it’s not tight. So I just screwed it on a few turns. Be sure to tighten it enough that you can’t jerk the trailer off. Probably tight enough so there isn’t a lot of slack.