As someone else said. Having the TV pulling forward slightly on the trailer allows the jaws to open when the dual cam lock swings around to be parallel to the front extensions of jaws. If the trailer is pushing forward on the TV then the latch arm will not stay open, unless it is pinned or tie back in the open position.
The B&W mechanism is different than most other hitches. There are no latches to release. The dual cam on the inter end of the release handle is cross wise to the front jaw extension when it is locked, blocking the jaws from opening. When the handle is swung to the release position, the jaws will open when the king pin puts pressure on them. Remember the handle is spring loaded in favor of being lock. So to release the king pin there needs to be pressure pulling back on the jaws as the handle swings to the release position, or held or tied to the open position. Other wise the spring just closes it again, allowing the dual cam to block the jaws from opening.
Chris
The dual cam is the smaller center pin you see on the turn table in this picture. The two jaws have forward extensions. When the cams are cross wise the jaws will not open, when the handle is swung to the open position, the jaws can pivot on their pins(the two larger ones.
I would also note that if the trailer is lifted to high off the turn table then the bottom flange of the king pin would pull up against the jaws, making them hard to open.
2021 F150 2.7 Ecoboost - Summer Home 2017 Bighorn 3575el. Can Am Spyder RT-L Chrome, Kawasaki KRX1000. Retired and enjoying it! RIP DW 07-05-2021