Abstract: A system for removably and pivotally securing a truck body onto the bed of a truck is provided in which the truck body is automatically locked to the bed of the truck as the truck body is lowered onto the truck bed. The system comprises a plurality of guide members secured to the bottom surface of the truck body and an adapter frame secured to the truck bed which receives and guides the guide members as the truck body is lowered onto the truck bed. A plurality of latch members are pivotally secured to the guide members and automatically lock the truck body onto the adapter frame when the truck body reaches its lowermost position. An actuator is associated with each of the latch members so that actuation of the actuators unlocks the latch members and permits the removal of the truck body from the truck bed.