Coupler that is.
Finally got around to the coupler replacement project and some other towing related mods. Replaced the OEM coupler with this one https://www.etrailer.com/A-Frame-Tra.../BD028287.html
Coupler was $89 + free ship
Mobile welder was $275
Frontier trucks are notorious for weak rear suspension so added Bielstein shocks and Sumo Springs to beef things up. Had to use a wdh because the rear sag prior to these changes.
Also had to remove propane tanks for welder and took the tray off to check for rust, repaint and put back together with improvements. Used bicycle tube when reinstalling to prevent metal on metal, and lined the tray with rubber to protect from tank bottoms. Also reversed the regulator to face the rear since it provides a bit more room.
Just pulled a 500 mile trip with new setup and no wdh. Love the change with the coupler and suspension. No sag, trailer perfectly level on hitch, no coupler slop or noise when towing, 360 closure around the base of the ball.
Best of all hitching and unhitching is now a breeze. Coupler releases and comes right off, no more prying it up with a screwdriver or moving up n back till it lets go. The trailer towed like a dream without the no longer necessary, wdh, and it was so nice not messing with the wdh bars during the trip. My coupler lock pin fits much better on the Bulldog now as well, so one less thing had to replace.
Getting ready to go FT next summer, this is likely to become one of my favorite mods, since hitching and unhitching will need to be done more often and it just got a lot simpler.