A trailer defense system includes a trailer defense mechanism configured to couple with or be integrated within a trailer. The trailer defense mechanism includes a housing including sidewalls defining one or more slots, one or more engagement features configured to couple with a kingpin and be received within the slots such that the housing and the kingpin are slidably coupled together, and an actuator configured to operatively couple with the housing and actuate to transition the trailer defense mechanism between a locked state and an unlocked state. In the locked state, access to the kingpin is inhibited by the trailer defense mechanism such that the kingpin and a coupler of a vehicle are unable to engage with each other. In the unlocked state, access to the kingpin is permitted such that the kingpin and the coupler are not restricted by the trailer defense mechanism from engaging with each other.

A mechanism attached to the trailer of a semi tractor trailer that uses a low friction UHMW or similar bearing sheet material as an interface between the two components. This wear item is easily replicable without the use of fasteners such as screws nuts or bolts. The invention uses a plug and play bayonetted snap in methodology and is easily installed on new or existing rigs such as 18/26-wheeler highway transports. The wearable bearing can be replaced by novice operators not skilled in technical installations in only a few minutes and at very low cost.