Abstract: A locking apparatus for locking a fifth wheel king pin includes a cylindrically shaped lock body that fits over the king pin and covers it. A lateral passageway through the locking body receives a locking member that includes a pair of shanks that fit the king pin at annular shoulder portions. The lateral passageway has open end portions that communicate with the outer wall of the lock housing or lock body. End portions of the locking member occupy the channel at the openings to prevent a thief from gaining access to either end portion of the locking member with a hammer, saw or torch.

Abstract: A locking apparatus is provided for locking the rear doors of a trailer that has door closing members that include left and right vertical bars on the doors and horizontal clasps that attach respectively to the bars. The apparatus includes a pair of structural blocks that are attached to the doors using bolting or welding for example. A hollow spanning member is transversely positioned to span between the blocks, the spanner member having a central open-ended bore that communicates with preferably both end portions of the bar. Each of the blocks has a receptacle that slidably receives an end portion of the bar. One of the blocks has a vertical channel that extends through the block between its upper and lower surfaces and which communicates with the receptacle. This enables a locking member to be positioned in the channel and form a connection with the bar at the intersection of the receptacle and the channel.