Haven't done much but drive the thing and get it dirty lately, until tonight.
Tonight I finally got under the rear and solved the obnoxious noise it's been making ever since I put the trailer hitch on. I guessed pretty early on that the noise was the hitch making contact with the muffler or the bumper cover, but couldn't actually prove it, and didn't have time to deal with it. Besides as LOUD and OBNOXIOUS as it was, with the top down and/or the radio cranked, I couldn't really hear it!
Anyway, tonight I got under there, and there's a dent in the muffler perfectly lined up with a bare spot in the powdercoat on the hitch - clearly the point of contact. So, I took a piece of radiator hose, cut it in half and zip-tied it around the hitch at the point where the contact occurs. Took it for a test-ride and NO noise! YAY!!!
After that, I did the most half-assed wash job I've done in a long time, mostly 'cause I can't find most of my car-wash tools. Eh, it's got to be better than it was.
All in all, a good day for the Mustang.