Abstract: A member formed of saw and bolt cutter resistant, hardened steel which is insertable between the arms of the U-joint of a truck steering system and locked in place by one or more padlocks. So installed, the member prevents steering of the truck, thereby preventing theft of the truck.

Abstract: This invention relates to equipment for securing a truck trailer against theft by protecting the trailer kingpin against being secured by a tractor. The device employs a lock housing or body which has a hole which is adapted to fit over the trailer kingpin. A sliding member is employed to go into sliding contact with the groove in a standard trailer kingpin. The sliding member is configured with a concave edge on one end in order to contact the annular groove in the standard trailer kingpin. A slot in the sliding member is used to engage the body of a heavy duty padlock when in the locked position thus holding the sliding member in contact with the trailer kingpin. A retaining means such as a screw threadably secured to the lock body and a mating slot in said sliding member is employed to prevent the inadvertant removal of said sliding member from the lock body.

Abstract: Lock-protecting hasp for trailer full swing rear doors having locking bars which secures to the bars of the rear doors and includes two mating members and a shackle lock whether the lock be key or combination. A protecting block against the lock on the female mating member protects the shackle of the lock from being cut or pried off the body of the lock, or between the shackle, the body and the lock-protecting hasp. Longitudinal opposing slots and a ribbed locking bar on the male mating member provide for adjustability between the two members for accepting door bars spaced any distance dependent upon the type of trailer. The lock-protecting hasp particularly lends itself to use on semi-trailers having full swing rear doors and the lock-protecting hasp accepts a lock of predetermined size.