I had one, and for my 34', 8000lb 850# tongue trailer, it didn't work. BUT -
the trailer was way too light on the tongue, so prone to sway easily. Not enough TW on the friction cup to counteract the sway. Also a very long tail wagging the dog. I had no issue setting the WD to recover all the front rise of my truck. Loved the ease of setup and use.
With a shorter, lighter trailer that has proper tongue weight it may work well. At a guess, the OP's trailer might be at the very top of the range for it. Too bad there is no "try it for 30 days".
Rather than accumulate slightly used hitches in my garage, I just bit the bullet and got the very expensive, very heavy ProPride. Which definitively fixed the sway issue.
Sold it to a fellow with a trailer same length and a bit lighter than mine, at a steep discount. He got rid of it soon after, also.