A "De-Rattler"... interesting term! I've always known them as a Hitch Clamp.
Amaz... shows Hitch Clamp, Hitch Tightener, Anti-rattle stabilizer, etc.
I use them when towing anything, and have given several as gifts.
![](https://a4.pbase.com/g12/88/791988/2/171025803.y4vvB6HU.jpg)
I put a lot of effort into reducing slop at all movement points as well. There's slop where the tow bar mounts to the crossbar, crossbar to removable arms, arms to baseplate, etc.
Removing all excess slop helps reduce wear and toad wandering, and perhaps the OP's (and my) original issue of steering under/over sensitivity when towing.
Here's the remainder of my toad/tow setup, for those who haven't already seen it...
Towed/Toad project photo gallery