Hitch - Yes, Another Discussion
I thought I'd share my successful 'modification' to the trailer's hitch.
Last year, EVERY unhitching required up to 15 minutes of finagling to get the trailer off the truck's ball. Pry bars, hammers and screwdrivers were all pressed into service. This was frustrating, to say the least. (To say the most, I was considering setting the trailer afire.)
Before this 5K+ mile, 7 week trip, I got up inside the coupler and sanded out all of the paint, working from 60 grit up to 400. Guess what? No problem with uncoupling! (And the trailer never came unintentionally uncoupled, either!)
BTW, I lube the ball with just a small shot of bicycle cable & chain lube. It's much cleaner than lithium grease.