OK, after like 10 pages of responses, here comes my suggestion. First time I went to unhitch my new 23RLSW at a campground I spent over an hour fooling with it, getting nowhere. It's a different coupler than I had on my previous 165RB, and it just seemed like there had to be something I was missing. Finally in desperation I called my dealer's service department, and they set me straight.
- White lithium grease on the ball will help - the next time.
- Keep the coupler latch assembly lubricated, too. I use WD40 for that.
- You'll want to remove the weight distribution bars before doing this.
- Start by LOWERING the trailer so that the tongue's weight is mostly resting on your hitch.
- Press DOWN on the flip lever to release the coupler.
- Now make sure the rear of the lever is clear of the coupler, and push it BACK as far as it will go. It probably won't release unless you do that.
- Now raise the trailer tongue until the hitch releases.
I have had zero problems since I started using this procedure.
BTW, it also helps to reverse this procedure when hitching up.
P.S. My signature picture was taken during that frustrating hour of trying to unhitch.