Thank you all for the input. We have been working directly with a warranty manager at the manufacturer. They are going to have the service center look into the coroplast issue.
For the towing portion the dealer/service center provided frame measurements to manufacturer and said it was all in spec. Dealer provided a 4pt curt wd hitch to upgrade from the 2pt curt wd hitch. Unfortunately still had the towing issues. As a goodwill effort the manufacturer is providing us with a Hensley hitch so hopefully that will work?
Odd, because I run the 4 pt Curt hitch as well. I think its called a Tru-Track? Anyways, you might want to read up on how to set it up yourself and invest in the tools to do so. I don't have much faith in dealers to set up correctly. Don't get me wrong, I've had a couple do a really good job at it, but most others just wing it, or set it up based on perceptions of how you might load truck/trailer, and are often off the mark. Its not that hard to do, once you know how, but it can be time consuming to get it just right.
As for that style of hitch, if its like mine, it has these ball bearings that sit in a "detent". My understanding of it, is when sway starts to occur, and that bearing is out of the detent, the hitch is trying to force it back to the detent. This action could "feel" like sway, but may actually be the opposite. If your not used to how that works and feels though, you could be misperceiving it. Just depends on how severe it is. It does feel much better when it is right though. Quite a few factors at play, like the rating of the bars they gave you with the hitch, etc.
When my dealer set it up, I didn't care for it much at all...and that opinion was voiced loudly by my wife. It was always "great" on good days with no wind, etc. but maybe only "good enough" on windier days, more passing traffic. Eventually I had enough, bought the tools, found the flattest area I kind find to set it up and spent a couple hours in the instructions and videos, setting it up and measuring, then readjusting and measuring until I was satisfied. Has always been "great" ever since.
But what took me 2-3 hours took my dealer maybe 15 minutes? And I don't recall any measuring of any sort going on.