Package came today. Looks like a nice setup. A cat 1 pin drops past the locking lug and down into the cradle. To unlatch, just lift the bar, which retracts the locking lug. The bar is held up by a bolt mounted on a movable mount. After you drop the draft arms and drive forward., release the bar holding the locking lug in the retracted position.

I hope to mount them this weekend but might not make it. Depends on weather and other commitments.