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You are supposed to grease them, it's just that the amount of wear on them is almost non existent on smaller trailers. The semis are greased so heavily that walking by them will get some on you, but for your bumper pull trailer, grease is almost pointless for occasional towing (which is what...

Although you are supposed to grease all trailer couplings, most smaller (under 20k) trailers and couplings aren't greased because it just gets on everything, and it's not enough weight to matter for most people.