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When we had TTs, the WD bars would creak. I greased any point that had moving metal to metal contact. Of course, this means dirt and the need to occasionally clean and relube those points. The lube points were the bar trunnion heads, the lift bar chain ends (both) and the ball. Something else to look at is the bolting - hitch to TV and the bar chain adapter ends to A-frame and retighten. Our last arrangement only had a single long bolt to tighten the chain bracket and that bent, allowing the adapter to swivel and needed some welded mods to fix permanently
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