Hitch plugs and methods for installing hitch plugs for covering an opening in a trailer hitch are provided. In one implementation, a tow hitch plug may include a body having an outer surface that may correspond to inner dimensions of a cavity of a tow hitch receiver of the trailer hitch. The tow hitch plug may include a flange connected to a front end of the body in embodiments. The flange may radially extend beyond the outer surface of the cylindrical body and a threaded hole may extend through the flange in embodiments. Also, in embodiments, the tow hitch plug may include an arm connected to an end of the body and a lock insert connected to the arm. In a locked state, the lock insert may be inserted through an opening in a bracket of the trailer hitch at a back end of the tow hitch receiver in embodiments.

A plug for insertion into a through hole of a king pin coupler plate of a trailer includes a body defining an axial direction and having an outer surface defining a perimeter with a distance around the perimeter. A plurality of pliable ears extend from the outer surface. The ears are each individually aligned in the axial direction. The ears each have a width that is less than ten percent of the distance around the perimeter of the outer surface of the body.

A plug for insertion into a through hole of a king pin coupler plate of a trailer includes a body defining an axial direction and having an outer surface defining a perimeter with a distance around the perimeter. A plurality of pliable ears extend from the outer surface. The ears are each individually aligned in the axial direction. The ears each have a width that is less than ten percent of the distance around the perimeter of the outer surface of the body.

A protective apparatus for a trailer tongue jack having a head and a column may include a protective cover having a shape that substantially conforms to the shape of the head, and an opening to accommodate the column when the protective cover is placed on the jack. First and second hook holders may be adapted to connect hooks for first and second trailer safety chains to the protective cover when the chains are not in use. A plug holder may be adapted to hold a plug for a trailer wiring harness when the harness is not in use. The protective cover may include an access port that aligns with a user interface on the jack when the protective cover is placed on the jack.

Components and devices are disclosed which are made from or otherwise include a protective material configured to release corrosion protection molecules. These exemplary components and devices can be included with trailer hitch mounts, hitch mount assemblies, and associated hardware to provide protection against rust and corrosion.

A trailer jack protection arrangement that includes a cushioned plastic or rubber surface in the event of contact between a trailer jack and a portion of the vehicle, such as a tailgate. The arrangement is attached to the trailer jack via the jack stem and projects above the jack handle or jack top cylinder, depending on the type of jack. The arrangement utilizes an embedded metal stamping to provide a mounting surface and extra stability for the plastic or rubber impact surfaces. The arrangement also utilizes a Teflon washer underneath it for lubricity and stability when it also turns as the jack handle turns to move the trailer up or down, on a top wind jack. The alternative design provides protection for a side wind jack using an adapter, which can have several different forms to accommodate all types of trailer jacks. The design requires installation and prevents easy removal of the invention so it is not lost or stolen.

A dirt protection cover arrangement with a semi-trailer (2) and a towing vehicle (3), for closing a hollow-bored king pin (21) on the semi-trailer (2) for an automatic fifth-wheel coupling, the king pin (21) being arranged on the underside (20) of the semi-trailer (2) as a counter-bearing for a fifth wheel (31) of the towing vehicle (3), a dirt protection cover device (1) being arranged such that it is adjacent to the underside (20) of the semi-trailer (2) and can rotate about the king pin (21), said dirt protection cover device including a dirt protection cover (11) for covering the borehole (22) in the king pin (21), and the dirt protection cover (11) being configured on the dirt protection cover device (1) such that, during the coupling process, it can be displaced from a base position covering the borehole (22) in the king pin (21) into a coupled position exposing the borehole. Also, a dirt protection cover device (1) for a dirt protection cover arrangement, and a coupling method involving same.

Trailer theft is a widespread problem, and existing locks have failed to solve the problem for a number of reasons. Some locks require permanent modification of a trailer jack, while others are easy to break into. The present invention provides a detachable trailer jack locking assembly including a retention shell couplable to a trailer jack body. The retention shell is sized and shaped to surmount an upper end of an outer tube of the trailer jack. The retention shell also includes a slot configured to accept a handle of a lifting assembly on the trailer jack. The assembly includes an attachment point disposed on the outer tube of the trailer jack. A lock is adapted to secure the retention shell against the outer tube by coupling with the attachment point. When engaged, the handle is immobilized within the slot, thereby rendering the lifting mechanism of the trailer jack inoperable.

A shield housing mounts a yaw sensor onto a trailer structural element. A shield body defines a sensor cavity within a closed bottom, an open face, and a perimeter wall with a side opening. A mounting post extends from the closed bottom into the sensor cavity and is adapted to affix the sensor at a predetermined orientation in the shield body. A pair of side wings extend laterally from the perimeter wall. Each side wing has a respective groove adapted to retain a respective strap loop tensioned over the groove and the structural element. In one preferred embodiment, the perimeter wall may have a base edge, and the side wings may each have a base surface opposite the grooves. The base edge and the base surfaces may have a contoured profile configured to orient the housing in a predetermined direction on the structural element.

An apparatus for providing secure access to a trailer connector includes: a cover, a locking device, and a controller. The cover is configured to be secured to a trailer and to cover at least one connector of the trailer. The cover has an open position in which the connector(s) are accessible and a closed position in which the connector(s) are inaccessible. The locking device has a first state configured to hold the cover in the closed position and a second state configured to permit the cover to move from the closed position to the open position. The controller is configured to cause the locking device to change from the first state to the second state, to permit the cover to move from the closed position to the open position, based on an authorization.