Controllably expandable

Claim 1

A COMBINATION PICK-UP TRUCK AND CONTROLLABLY EXPANDABLE CAMPER COMPRISING: A PICK-UP TRUCK HAVING A REARWARDLY DIRECTED HORIZONTAL BED PROVIDED WITH LATERALLY SPACED PARALLEL UPSTANDING SIDE WALL PARTS TERMINATING IN UPPER EDGES; A FIRST WALL-DEFINING PORTION OF SUBSTANTIALLY INVERTED U-SHAPED CONFIGURATION NORMALLY OVERLYING THE BED OF THE PICK-UP TRUCK AND SUBSTANTIALLY COEXTENSIVE WITH THE PLAN VIEW AREA THEREOF, SAID FIRST WALL-DEFINING PORTION BEING PROVIDED WITH PIVOTAL MOUNTING MEANS AT REAR BOTTOM EDGES THEREOF FIXEDLY ATTACHED TO UPPER REAR CORNER PORTIONS OF THE SIDE WALL PARTS OF THE PICK-UP TRUCK BED FOR ARCUATE PIVOTAL MOVEMENT OF SAID FIRST WALL-DEFINING PORTION ABOUT A HORIZONTAL AXIS FROM SAID POSITION SUPERIMPOSED OVER THE PICK-UP TRUCK BED INTO A REARWARDLY EXTENDED POSITION LYING BEHIND AND PARTIALLY BELOW THE PICK-UP TRUCK BED AND DEFINING A REARWARDLY DIRECTED PARTIALLY DOWNWARDLY STEPPED EXTENSION OF THE PICK-UP TRUCK BED; A SECOND WALL-DEFINING PORTION OF SUBSTANTIALLY INVERTED U-SHAPED CONFIGURATION SUPERIMPOSED ABOVE THE PICK-UP TRUCK BED IN REARWARDLY SLIDABLY MOUNTED RELATIONSHIP WITH RESPECT THERETO AND POSITIONED WITHIN SAID FIRST WALL-DEFINING PORTION WHEN IN AN INITIAL POSITION; SAID SECOND WALL-DEFINING PORTION HAVING DOWNWARDLY DIRECTED LONGITUDINAL LOWER SIDE EDGES PROVIDED WITH SLIDABLE ENGAGING MEANS; SAID FIRST WALL-DEFINING PORTION, WHEN IN SAID REARWARDLY EXTENDED POSITION, HAVING UPWARDLY DIRECTED LONGITUDINAL UPPER SIDE EDGES POSITIONED IN SUB-