Abstract: An apparatus for assisting with the handling of a door of a tailgate cart features two springs that are strung in seriatim. The first spring is connected at one end to the tailgate door, and connects to the second spring at its other end. The second spring is anchored at a distal end to the frame of the tailgate cart. The first spring has a shorter length than the second spring. As the tailgate door is pivotally lowered from its upright position, the shorter spring moves in tension providing a matching small force. As the tailgate door reaches the end of its travel, the second spring adds its compressive force to the first spring, and a greater force is provided to counterbalance the door.

Abstract: A kit is described that modifies a standard screw jack for a trailer hitch, by introducing a safety lock mechanism. The modified screw jack will be inoperative until the safety lock mechanism is opened. In the inoperative position, the screw jack cannot be turned to lift or lower the trailer hitch. The crank for turning the screw jack will be freewheeling or frozen. Turning a key in a lock keyway will release the safety lock mechanism, thus putting the crank into rotational engagement with the screw jack.

Abstract: The invention features a mailbox indicator for determining when the daily mail courier has deposited mail in a rural or suburban mailbox. The mailbox indicator features a pivotal rod, which is pivotally secured to a base. The base is attached to the top of the front end of a mailbox in proximity to, and extending out beyond, the door latch.