Re: hitch grease
We had the same creaking on turns and came to the same conclusion as you, namely that the trunnion points on the WDH needed some oil. We used 3-in-1 oil but I would think that Triflow would work as well. To try to keep the oil off of us, we put the bars carefully into paper trash bags and change the bags every once in a while.
We use white hitch ball grease for that purpose that you should be able to find easily. It comes in tubs that are the size of the ball so that you just put the tub over the hitch ball to grease it. We clean the ball on every arrival and put on a cover if removing the hitch. We use a shop paper towel for cleaning which has the grease off in less than a minute. And then re-grease before hitching again. You are also supposed to put some grease up inside the coupler at least every once in a while if not every time out.
Cathy. Floating Cloud
"Live in the sunshine, swim the sea, drink the wild air.... "