Closing the loop on this thread:
We found the travel trailer we were looking for. It's a 2015 Jay Feather X23B (same model mentioned in the OP above). We bought it from the original owner. The dealer had installed a Pro Series 49903 WDH with sway control when it was purchased. While it is a little over-rated for our needs, after pulling the TT twice I'm satisfied that it works fine. I posted a photo in the pinned post by BigDutch.