Abstract: An improved electric tongue jack with one or more memory buttons to retract or extend to a predetermined desired height. A first memory button is provided to engage in a memorizing operation to store a desired actual height of the hitch. When the first memory button is subsequently engaged, the motor gear assembly is controlled to return the hitch to the desired height. A second memory button is used as an automatic retraction for the jack leg once the trailer has been set on the hitch ball/tow vehicle. Once the auto retract location has been set, the user may push the auto retract button once and the leg will automatically retract to the preset height. The memory buttons are controlled by software in a printed circuit board inside the head of the jack.

Abstract: A tire chock with improved ease of use and prevention of theft. A threaded rod expands a scissor frame to force foot plates against a tire. The scissor frame foot plates are pulled apart or pushed together so that the frame fits between the tires. A hand-adjustable, freely rotatable nut is on the lower end of the rod is tightened. A wrench is used to tighten a second nut on the upper end of the rod, and a lock member is secured over the second nut.

Abstract: An adjustable support apparatus for a recreational vehicle permits rapid height adjustment with a spring mechanism of a handle-nut assembly on a threaded rod. A portion of the threaded rod is inserted into the hollow portion of a jackscrew assembly. A tab on the handle-nut assembly includes an over-sized hole intersecting a threaded hole for engaging the threaded rod. An approximate desired height of the support apparatus is accomplished by pushing a tab inward and sliding the handle-nut assembly to a desired position on the threaded rod. A fine adjustment to the desired height, if required, is made by turning the handle nut assembly so that it travels with respect to the threaded rod.