A powered jacking mechanism for semi-trailer landing gear is disclosed. The mechanism includes a coupling for attachment to an operating rod of a semi-tractor trailer landing gear jack. The coupling includes an idler sleeve for retaining the manual jack handle with the trailer during powered operation of the jack. The coupling includes a modified drive socket for selective coupling with either a drive end of the manual jack handle and a drive bit coupled to a rotary drive unit. In preferred embodiments, the rotary drive unit is a cordless screwdriver.

A powered jacking mechanism for semi-trailer landing gear is disclosed. The mechanism includes a coupling for attachment to an operating rod of a semi-tractor trailer landing gear jack. The coupling includes an idler sleeve for retaining the manual jack handle with the trailer during powered operation of the jack. The coupling includes a modified drive socket for selective coupling with either a drive end of the manual jack handle and a drive bit coupled to a rotary drive unit. In preferred embodiments, the rotary drive unit is a cordless screwdriver.

A linear jack includes a first outer sleeve, an inner sleeve disposed at least partially within the first outer sleeve, a second outer sleeve disposed at least partially within the inner sleeve, a translating screw disposed at least partially within the second outer sleeve, and a cover sleeve coupled to the translating screw. The first outer sleeve is threadedly coupled to the inner sleeve. The second outer sleeve is threadedly coupled to the translating screw. The translating screw is disposed at least partially within the cover sleeve. The cover sleeve is configured to translate with the translating screw.

A landing gear system and method of actuating the landing gear system, the system including a first leg assembly, a second leg assembly, a cross-shaft arranged between the two leg assemblies, and a landing gear actuator. The landing gear actuator includes a motor and a coupling shaft which is arranged to couple and decouple the landing gear actuator from the cross-shaft.

A landing gear system and method of actuating the landing gear system, the system including a first leg assembly, a second leg assembly, a cross-shaft arranged between the two leg assemblies, and a landing gear actuator. The landing gear actuator includes a motor and a coupling shaft which is arranged to couple and decouple the landing gear actuator from the cross-shaft.

A manual trailer lifting jack with drill power option includes: an outer tube; an inner tube that is telescopically slidable within the outer tube; a foot that is connected to a bottom of the outer tube; a top block that is connected to a top of the outer tube; a threaded rod that pass through a center of the top block and is rotatably held within the outer tube and fixed from axial movement relative to the outer tube; a threaded block that is connected to a top of the inner tube and has threads that engage the threaded rod so that a rotation of the threaded rod causes the inner tube to slide axially within the outer tube; a driving gear that is connect the top block and drives the threaded rod; a gear shaft that includes a bevel gear and a hexagonal head; and a gear housing that houses the gear shaft, driving gear, and the top block.

A method includes calculating, at a data processing hardware, a relative angle between a tow vehicle and a trailer attached to the tow vehicle. An absolute angle of the tow vehicle is determined at the data processing hardware. An absolute angle of the trailer based on the relative angle and the absolute angle of the tow vehicle is calculated at the data processing hardware. A dimension of the trailer is determined at the data processing hardware. A trailer levelling adjustment based on the absolute angle of the trailer and the dimension of the trailer is calculated at the data processing hardware.

A parked freight trailer stabilizer and restraint comprising: (a) a kingpin receiver configured to lock onto a kingpin of a parked freight trailer; (b) a jack operatively coupled to the kingpin receiver, the jack repositionable between a retracted position and an extended position; (c) a tail hold operatively coupled to the kingpin receiver, the tail hold repositionable between a stowed position and a restraining position, the tail hold configured to engage a ground mount; and, (d) a transport receiver configured to engage a transport vehicle.

A parked freight trailer stabilizer and restraint comprising: (a) a kingpin receiver configured to lock onto a kingpin of a parked freight trailer; (b) a jack operatively coupled to the kingpin receiver, the jack repositionable between a retracted position and an extended position; (c) a tail hold operatively coupled to the kingpin receiver, the tail hold repositionable between a stowed position and a restraining position, the tail hold configured to engage a ground mount; and, (d) a transport receiver configured to engage a transport vehicle.

A landing gear assembly includes a leg assembly, a gear assembly configured to telescopingly move a second leg portion with respect to a first leg portion, and a drive assembly including a gear arrangement configured to drive the drive shaft of the gear assembly at a high speed and low torque configuration and at a low speed and high torque configuration, an electric motor configured to drive the gear arrangement, and a controller configured to switch the gear arrangement from the high speed and low torque configuration to the low speed and high torque configuration in response to an increase in current draw by the electric motor as the second leg portion moves from a retracted to an extended position, and configured to maintain the gear arrangement in the high speed and low torque configuration as the second portion moves from the extended position toward the retracted position.