There is always a little flex when putting weight on or taking it off of the hitch pin. Not uncommon to hear a little creaking and groaning when that is happening. Like Grumpy indicated, it has to move some.
When you all say it that way, it makes complete sense. I guess I'm just a little anxious. Other than our grandchildren, "Big Bird" is the DW's and mine pride and joy.
Thanks to all of you for your input!