referring now in more detail to the drawings , in which like numerals indicate like parts throughout both views , fig1 discloses an extended cab pickup truck 10 that includes a cab 12 having both front 14 and rear 16 doors on each side , with a rear window 18 positioned in the rear wall 20 of the cab . horizontal load bed 22 is positioned behind the extended cab 12 , and the vertical side walls 24 and 26 are parallel to one another and extend upwardly from the sides of the load bed 22 , in the conventional manner . typically , a tailgate is hingedly connected to the rear edge of the load bed 22 . as illustrated in fig2 front seats 30 and rear seats 32 and 34 are located in the cab . the front seats can be a “ bench ” seat or can be in the form of separate “ bucket ” seats which are spaced apart from one another . the front seats 30 are spaced from the rear wall 20 of the cab . the rear seats 32 and 34 are spaced apart from each other and are located adjacent the rear wall 20 ( fig1 ) of the cab . therefore , the rear seats 32 and 34 and the front seats 30 define between them a load receiving space that is generally indicated at 36 . a load receiving container 40 is positioned in the load receiving space 36 , between the rear seats 32 and 34 , so that the rear seats 32 and 34 straddle the load receiving container . the load receiving container is approximately rectangular , including opposed vertical side walls 42 and 44 , opposed bottom wall 46 and top wall 48 , and a front wall ( not illustrated ) positioned adjacent the front seats 30 . the rear portion of the load receiving container defines a rearwardly facing opening 50 . rear wall 20 ( fig1 ) of the cab also includes a rear wall opening 52 , with the rear wall opening 52 in registration with the load receiving container 40 . preferably , the load receiving container will be slightly smaller in height and breadth than the rear wall opening 52 in the cab so as to be telescopically inserted through the rear wall opening 52 of the cab . the load receiving container can be removed from within said cab by moving it rearwardly , telescopically through the rear wall opening of the cab . however , the load receiving container can be larger in height and width than the rear wall opening and installed without movement through the rear wall opening . typically , the load receiving container will be firmly attached to the pickup truck by bolts ( not shown ) that can be removed for repair or replacement of the container . in some instances it might be desirable to remove the load receiving container from the cab and allow use of the space behind the front seats without the container . external door 54 is hingedly mounted at the rear wall opening 52 of the rear wall of the cab 12 and functions to close the rearwardly facing opening 50 of the load receiving container . the external door 54 preferably is mounted to the rear wall 20 of the cab by the hinges 56 . preferably , the hinge structure 56 is located at the upper edge of the rear opening of the cab so that the external door can tilt upwardly and open the load receiving container to the load bed 22 of the vehicle and move to a closed position by gravity . also , a latch 58 can be installed on the external door so as to register with the keeper 60 mounted to the cab or to the load receiving container , allowing the rear door 54 to be locked in its closed position . alternatively , the external door 54 can be mounted to the internal load receiving container , at the upper edge of load receiving container 40 by means of a conventional hinge structure . although the external door 54 is disclosed in the preferred embodiment as being a bottom opening door with the hinge positioned on top , other types of doors and door connections can be used for attaching the external door in closed relationship about the rear wall opening 52 and the rearwardly facing opening 50 of the load receiving container 40 , such as a side opening door with a hinge structure at a side edge of the door , or a releasable hatch , or a sliding door , or any door configuration that assures closure to the outside elements and safe operation of the vehicle . preferably , load receiving container 40 will include an internal opening such as the upwardly facing opening 62 in top wall 48 , and an internal door such as hatch 64 is hingedly mounted to one edge of the internal opening 62 for selective opening and closing of the load receiving container 40 from inside the cab of the vehicle . this provides the passengers in the cab access to the load receiving container . the internal door can be mounted on a wall other than the top wall 48 , if desired . however , the placement of the internal door 64 should not be positioned so as to be subject to being forced open by the load carried in the internal compartment of the load receiving container 40 due to abrupt movements of the pickup truck . another embodiment of the invention is the extended cab pickup truck as described but without rear seats . when in this configuration , the load receiving container will be straddled with extra space for receiving a larger load . while a preferred embodiment of the invention has been illustrated and described herein , those skilled in the art will understand that variations and modifications of the invention can be made without departing from the spirit and concept of the invention , as limited by the following claims .