I've had basically the same question. My hitch creaks on sharp, slow turns, but my dealer said that is normal, so I haven't worried about that. However, the latching mechanism on my trailer frame has gotten rusty and very balky to move so that it clamps down against the hitch ball. And at times, I've had a hard time getting the hitch ball to release. Bought a sledge hammer to persuade it, just in case. I've thought about spraying some dry lube graphite on the latching mechanism, but was wondering (1) is that OK to do and (2) would it work. Or what else might work.