A tri-ball trailer hitch coupler lock has three differently sized ball substitute members. A lanyard extends in two directions off a portion which adjoins the ball substitute members, with mating portions of a lock permanently attached to each free end of the lanyard. One portion of the lock terminates in a pin sized to fit in the latch pin opening of the coupler, and the other portion of the lock is matably lockable onto the pin after the pin has been extended through the coupler pin opening. The lanyard preferably passes through an opening in the adjoinment portion offset from the center.

A tri-ball trailer hitch coupler lock has three differently sized ball substitute members. A lanyard extends in two directions off a portion which adjoins the ball substitute members, with mating portions of a lock permanently attached to each free end of the lanyard. One portion of the lock terminates in a pin sized to fit in the latch pin opening of the coupler, and the other portion of the lock is matably lockable onto the pin after the pin has been extended through the coupler pin opening. The lanyard preferably passes through an opening in the adjoinment portion offset from the center.

A double-safety trailer lock with an adjustable length comprises a lock bar and a lock body matched with the lock bar, wherein one end of the lock bar far from the lock body is a large-diameter end, an external thread is provided on the large-diameter end, an adjusting sleeve is arranged outside the large-diameter end, and an internal thread is provided on the inner wall of the adjusting sleeve, so that the adjusting sleeve can move axially along the large-diameter end by matching the internal thread with the external thread; through the axial movement of the adjusting sleeve relative to the lock bar, the effective length of the lock bar can be adjusted, and the effective length of the lock bar is basically the same as the required length between the actual family car and the trailer, so that the movement of the lock bar in the use process is minimized, and the connection of the trailer lock is more stable.

A security device for preventing unwanted attachment to a trailer coupler. The trailer hitch lock is formed by a lock body with notched arms and a lock bar that engages the notched arms of the lock body. The lock body engages the coupler mechanism of a trailer hitch and the lock bar secures the trailer hitch with a pad lock.

A security device for preventing unwanted attachment to a trailer coupler. The trailer hitch lock is formed by a lock body with notched arms and a lock bar that engages the notched arms of the lock body. The lock body engages the coupler mechanism of a trailer hitch and the lock bar secures the trailer hitch with a pad lock.

A lock for securing a hitch coupler and safety chain hooks, the hitch coupler being attached to a trailer's towing tongue and the safety chains and hooks being attached to the towing tongue, the lock incorporating a primary lock including an enclosure having a floor and a ceiling; a bolt attached to and extending into the enclosure from the floor; a seam segmenting the enclosure and facilitating movements of the ceiling between a first and second positions, wherein, upon movement of the ceiling to the first position, the ceiling overlies the bolt, and upon movement toward the second position, the ceiling displaces from the first position; a releasable latch attached to the primary lock, the releasable latch being adapted for resisting movements of the ceiling; and a secondary lock incorporating a hitch coupler lower surface and the chain hook receiving eye.

A lock for securing a hitch coupler and safety chain hooks, the hitch coupler being attached to a trailer's towing tongue and the safety chains and hooks being attached to the towing tongue, the lock incorporating a primary lock including an enclosure having a floor and a ceiling; a bolt attached to and extending into the enclosure from the floor; a seam segmenting the enclosure and facilitating movements of the ceiling between a first and second positions, wherein, upon movement of the ceiling to the first position, the ceiling overlies the bolt, and upon movement toward the second position, the ceiling displaces from the first position; a releasable latch attached to the primary lock, the releasable latch being adapted for resisting movements of the ceiling; and a secondary lock incorporating a hitch coupler lower surface and the chain hook receiving eye.

A recreational vehicle support stand that is configured to further provide indication of parameters such as but not limited to ownership, sports team affiliation or advertisements. The recreational vehicle support stand further includes a frame wherein the frame includes a plurality of vertical support members and horizontal support members. The frame is configured to support an end of a recreational trailer. The present invention further includes a cover member. The cover member is circumferentially disposed the frame extending between the top and bottom thereof. The cover member further includes a fastener that is operable to facilitate the removal or placement of the cover member on the frame. The cover member includes at least one pocket secured to the outer surface thereof. Various indicia may be imprinted on the outer surface of the cover member.

A recreational vehicle support stand that is configured to further provide indication of parameters such as but not limited to ownership, sports team affiliation or advertisements. The recreational vehicle support stand further includes a frame wherein the frame includes a plurality of vertical support members and horizontal support members. The frame is configured to support an end of a recreational trailer. The present invention further includes a cover member. The cover member is circumferentially disposed the frame extending between the top and bottom thereof. The cover member further includes a fastener that is operable to facilitate the removal or placement of the cover member on the frame. The cover member includes at least one pocket secured to the outer surface thereof. Various indicia may be imprinted on the outer surface of the cover member.

The present technology describes systems and methods for power coupling of a tractor-trailer system. The technology may include a robotic arm, an end effector, a coupling tool, and a tool resting rack. An electrical outlet on a trailer may be coupled with a tool under control of the end effector and positioning of the robotic arm. The end effector may include a housing, a motor, a clutch, and a drive shaft. A tool coupled to the end effector may include an electro-mechanical (EM) coupler. The EM coupler may include a housing, an electric plug, a lid lifter, a lead screw, and a servomotor.