good pictures, you put a lot of effort into that setup! While I do have a locking anti-rattler on the drop bar, there is some looseness in the towbar I'll take a closer look at. In my case it's an old Stowmaster (car mounted, uses 2" ball on motorhome) that I bought used. It was last on a 1995 Saturn, so it's probably about that old, though it sat most of it's life in the previous owners shed after they sold the RV in the early 00's (at least that was the story I got).
It's in good shape with no rust, but there is some room for improvement on the sliding bar as well as the crossbar clips like you've done.
I see I can buy a full rebuild for the bar for under $50 on etrailer, I may do that this winter too just for kicks, although the sliding arms are not where the slop is.
Overall, in retrospect this is not the ideal car for a toad, as it's quite heavy at ~4000# and sits really low. I dragged the bottom of the tow ball a lot with the required 10" drop. But it's the car we own, it's low miles and paid for (and an awesome commuter in daily life).