We started with one when we bought our 21C new. ETI installed the Andersen hitch, however they stopped selling it after only a year or two. We had some problems- notably the chains wearing the chain guides and LSS we got a full refund- not from ETI who sold it to us but Andersen.
It also was wearing on our coupler and had to replace it. This was a known problem and reported on the Airstream Forum. I know many here and elsewhere do like it and Andersen has done some redesign since we bought ours.
I would call Andersen and discuss your Tow Vehicle and get a recommendation from them. The one sold to us had a standard length shank at the time and it was not long enough to allow us to open our rear hatch on our SUV. Others had a similar issue with lowering the tailgate on their trucks. Andersen will make the shank to the specific length that you need to avoid that problem.
https://andersenhitches.com/
We went to a Pro Series with 600# round bars (ETI calls it "Equalizer")- which is what we had with our 17B and it is super easy to set up & remove the bars. While it does not have sway control, the 21C is probably the least likely model to encounter sway with so much weight up front. We've never had hint of sway over the last almost ten years and a lot of miles.