The Pacific Northwest seems to be the capital of the RV suspension improvement world. There's Henderson's Lineup (developers of Super-Steer products), Eric's RV (Eric Davis developed the Tru-Trac front track bar for Class A's), Brazzel's (has a line of rear track bars, probably more).
The majority of Track Bars for Class C's seem to be fabricated in one plant out there someplace and marketed through several brands with different part numbers and painted different colors. They're sold through many outlets so it's possible to shop for price and shipping terms.
I've visited Henderson's and had a phone conversation with Eric Davis. John Henderson was very cordial and helpful in person and so was Eric on the phone. We were talking Track Bar when Eric tossed out a "free tip" which was to be sure there is virtually NO play in the rig connecting Toad to RV. That would be Receiver, Drop/Lift Adapter, Tow Bar, Connection of Bar to Baseplate, and Baseplate. Total of 1/2" at the very most.
I mention Eric's tip because many of us install a Track Bar to help with control of a toad. The point here is that mods to the RV can counter bump-steer from a loose tow rig but will not completely eliminate it.